Best RO Water Purifier For Home In India 2021 – Buyer’s Guide & Reviews!

4.5/5 - (53 votes)

Can you afford to get into bad health because of the bad quality of the drinking water? No right? So, do not delay bringing home the best water purifier in India, and take a step towards a healthy life. 

best water purifier in india

In this article, we will discuss the best RO water purifier from best water purifier brands like LG, AO Smith, Hindustan Unilever, Kent, Eureka Forbes, Blue Star, Havells, etc. We will cover features, pros, cons in-depth for each water purifier. Lastly, a comprehensive and detailed buying guide covering the following topics:

  • Causes Of Water Pollution
  • Impurities In Drinking Water
  • Total Dissolved Solids (TDS) in Drinking Water
  • Technologies Used In The Best Water Purifier
  • Things To Consider Before Buying The Best Water Purifier For Home

Water-borne diseases are the most fatal among all other sources. The impurities directly get into your body and result in deadly infections like cholera, diarrhea, typhoid, and so on.

So make your drinking water free from pollutants like TDS and arsenic by installing the best RO water purifier.

This will provide you with the purest drinking water to make your home safe from water-borne diseases.

Here we have a list that you can take as a reference in this endeavor. So, read the whole article, and make sure you pick the right one.

We highly recommend that you read the Water Purifier Buying Guide at the end of this article to get in-depth knowledge about all the latest water purifying technologies and make the informed choice.
Table of Contents show

Key Factors before selecting the Best Water Purifier for Home:

  • Purpose: Your purpose in buying the appliance is fundamental. For example, the purifiers come with several features. Some with activated copper ions, some with hot water options.
    Thus, people preferring hot water should choose the purifier that comes with such an option. On the other hand, people who would prefer to get copper-infused water choose such a feature.
    Therefore, based on it, consider buying the ideal one that suits and matches your purposes.

  • Family Size & Capacity: Another important factor to note before buying is the capacity of the appliance and your family size. The family size and the capacity of the appliance are directly proportional.
    For example, if you have a small family, then consider buying a smaller appliance. Similarly, having a larger family, you must opt for a larger capacity.
    Thus, if you are buying it for household purposes, then your family size is the main criterion.

  • Check the TDS Level: Check the TDS level of your household water source. Make use of a TDS meter. Accordingly, you must select whether to consider RO, UF, or UV water purifiers.
    However, if you are unable to check, go for RO+UV+UF water purifiers.

  • Key Features: Before buying, check some key features. For example, the quality of RO, the different fail alert systems.

  • Brand and After-sale Service: Also, check for the warranty and after-sale service before selecting one.
    Do not miss checking the buying guide section below. It discusses everything you need to know before buying a RO water purifier.

How Do We Rank a Water Purifier?

Before getting into the list, here is how we rank the products in the list. In order to rank the best products, we have followed some important criteria. Here are those listed below.

  • Features: Listing down the appliances, the foremost aspect we consider are the features of the purifiers.

  • Price: We check the overall features of the products with the price at which the brands and manufacturers are selling them. Depending on the features-price compatibility, we rank the products. Value for money is what we try to ensure.

  • Customer Reviews and Experience: Customers’ reviews and experience play a crucial role in ranking and rating the products. We go through in-depth research on the customers’ overall experience as seen on various online platforms.

  • Brand & Warranty: We prioritize the brand and the warranty it offers. Based on the warranty they provide, we rank them accordingly in our list, keeping in mind other things as well.

  • After-sale Service: In addition, we look into the after-sale services as well. It is an important factor that we take into consideration in ranking the products.
    Though you might find some poor customer services in some products. However, they are listed because of their unique features and good customer experiences.

Best Water Purifier in India 2021

This list is made on the basis of hours of research, the data we collected from users review, feedback, technical specification and obviously value for money.

1. HUL Pureit Eco Water Saver Mineral RO+UV+MF Water Purifier

HUL Pureit Eco Water Saver Mineral RO+UV+MF wall mounted/Counter top Black 10L Water Purifier

Key Highlights:

Storage Capacity: 10 L
Purification: 7 purification stage
Special Features: Eco Recovery Technology,
Wastes less water, Minerals enriched water,
Germ Kill Kit indicator, Advanced Alarm system

Our list begins with HUL Pureit Water Purifier. Here is a short review of this product.

One of the most notable features of this appliance is that it runs on Eco Recovery Technology.

It offers an efficient purification. In addition, unlike other ROs, it does not waste water instead saves it. We have tested it and got results that match the brand claims.

Note that you can drink water that is enriched with important minerals like Magnesium and Calcium.

The water passes through 7 purification stages. The RO, UV, MF rejects harmful bacteria, viruses, pesticides, and heavy metals.

Another important feature of this water purifier is that it comes with a large 10L storage tank.

The feature which I loved the most is the Germ Kill Kit indicator. It alerts you 15 days before the Germ Kill Kit expires. 

Our research team tested it and found positive results.


  • You get minerals enriched water
  • A large storage tank is helpful
  • The advanced alert system alerts you before Germ Kit expires


  • Installation issues
  • Leakage issues after installation
Final Verdict:This RO water purifier from Pureit is ideal for people having a large family. It has a 10L storage tank. Also, it saves water.
In short, it is a good one for large families to spend on.

2. AO Smith Z9 Green RO 10 Litre Wall Mountable Water Purifier

AO Smith Z9 Green RO 10 Litre Wall Mountable , Table Top RO+SCMT Black 10Litre Water Purifier

Key Highlights:

Storage Capacity: 10 L
Purification: 8 purification stage
Special Features: Mineralized hot water
Night assist, Advance Alert System

This water purifier from AO Smith is designed with night assist. With it, it becomes easier to locate the purifier in the dark.

Note that here, the water passes through 8 purification stages. Our team has checked and confirmed it. There is a pre-filter, sediment filter, ART MAX, RO Membrane, and many others.

The ART MAXX technology is the best here, in my opinion. It is instrumental in recovering 2 times more water when the water runs through the purifier. Thus, it ensures less water wastage.

In addition, the MIN TECH adds the essential minerals in the water. Also, it maintains a proper pH balance of the water essential for drinking. We have checked this pH factor. 

One of the most notable features is that it comes with RO + SCMT. This is an extra purification stage. Basically, it ensures that there is no additional microbial contamination once the RO purification is done.

Thus, this water purifier offers you healthy water with double protection.

Another important factor, especially in this covid pandemic situation, is that the purifier offers mineralized hot water. Thus, you can easily drink hot water. Also, you can easily make tea.

The Advanced Alert system is a very convenient and useful feature, according to me. It alerts you beforehand when the RO membrane and other filters need to be changed.

The alert actually works well when we tested it. Thus, it is true to what it claims.


  • Easy to locate the purifier at night
  • Comes with both hot and cold water option
  • Minimal water wastage
  • Easy and convenient to use


  • The hot water functions only when the tank is full
Final Verdict:This water purifier, due to its 8 purification stages, almost tops the list. Also, this water purifier is a perfect option for people who want to drink water with a proper pH balance. Also, the features as claimed are true in actual practice.

3.HUL Pureit Copper+ Mineral RO + UV + MF Water Purifier

HUL Pureit Copper+ Mineral RO + UV + MF 7 stage Table top / Wall Mountable Black & Copper 8 litres Water Purifier

Key Highlights:

Storage Capacity: 8 L
Purification: 7 purification stage
Special Features: Copper + RO
Dual Water Dispensing,
Copper Auto-Cleaning

Again Pureit comes in with another water purifier. This water purifier is featured with Copper + RO. This water purifier claims that it offers the right amount of copper in a glass of water.

Note that it is the world’s first RO with Copper charged technology. 

There are a number of health benefits of copper (the right amount) in the water. It boosts immunity which is necessary for this pandemic situation. 

It is instrumental in fighting obesity and also improving your overall digestion as well.

One of the most notable features of this water purifier, in my opinion, is the Dual Water Dispensing. You can choose whether you want Copper charged RO water or simply RO water.

In addition, there is intelligent Copper Auto-cleaning. The brand claims that the machine smartly senses and sets the copper auto-cleaning. Thus, you can drink fresh copper infused water.

Note that the water passes through 7 purification stages. On the other hand, it comes with a large storage tank of 8L.


  • You can choose either RO water or Copper charged RO water according to your choice
  • Benefits of copper charged water sum up to the benefits of this water purifier
  • A good storage capacity is a plus point
  • Water tastes good


  • Issues with the tap
Final Verdict:It is a good water purifier infused with the benefits of copper. This water purifier is ideal for people who would love to take the benefits of copper in water.
If you have a large family and some want copper-infused RO water and some RO water, it is the best option. Also, that it has a good storage capacity that will suit a large family.

4. Eureka Forbes Aquaguard Aura 7L water purifier

Eureka Forbes Aquaguard Aura 7L water purifier UV e-boiling+Ultra Filtration with Active Copper, Mineral Guard Technology,

Key Highlights:

Storage Capacity: 7 L
Purification: Multi-stage purification
Special Features: Active Copper technology,
Compact design, Stylish tap,
Ultrafiltration process, Wall mount or tabletop

Our next rank on the list of best RO water purifiers is from Eureka Forbes Aquaguard. This machine also comes with active copper technology. 

To begin with its review, the water purifier is convenient. You have the provision either to mount on the wall or keep it on the tabletop.

In addition, the compact design is a plus point. The stylish tap and the elegant look adds to its kitchen decor.

Now, coming to its multi-stage purification. It starts with I-filter, where it removes dirt, sand, dust, and mud from water. 

The second stage Chemi Block reduces chlorine and other organic impurities. Also, absorbs bad taste and odor from the water.

The next stage adds crystal clear clarity to drinking water. Then the Mineral Guard retains the essential minerals in the water.

Finally, UV e boiling ensures the purity of the water, and Active copper technology infuses copper ions in the water.

Note that these purification stages as claimed by the brand are true, as observed by our team.

In addition, as the brand claims, there is an ultrafiltration process that offers you bacteria and virus-free water. 

Though the water storage tank is comparatively less (7L) but is sufficient for a medium sized family.

The best part of the water purifier, in my opinion, is that you can enjoy the benefits of the copper ions. It offers healthy metabolism. Provides energy to your body and helps in growth and development.

Another notable aspect of the brand, especially during this pandemic situation, they make sure about the sanitization part. 

The professionals who come to fix the appliance wear mask, sanitize their kits before the visit. Also, note that their temperatures are scanned daily. 

Thus, do not worry about the sanitization part.


  • Comes at an affordable price
  • The brand takes care of sanitization
  • Get the benefits of Copper ions
  • Convenient to set


  • Poor installation service
  • Some complained about their after-sale services
Final Verdict:This appliance is good and is true to what the brand claims. It also comes with copper + technology but compared to the previous one; it has been ranked 4th due to its storage capacity.
The storage capacity here is comparatively less than the one ranked 3rd. Otherwise, the water purifier is good.
Note that it also comes at an affordable price. Therefore, for people looking for copper + technology water purifiers at a reasonable price, this is it.

5. KENT Supreme RO + UV + UF + Alkaline + TDS Control + UV in Tank

KENT Supreme Extra 2020 (11113), Zero Water Wastage, Wall Mountable, RO + UV + UF + Alkaline + TDS Control + UV in Tank

Key Highlights:

Storage Capacity: 8 L
Purification: Multi-stage purification
Special Features: Zero water wastage,
TDS control system, Alkaline water,
UV disinfection, Filter change alarm,
UV fail alarm, Huge purifying capacity

Kent brings in a lot of features in this RO water purifier. The review begins with its best feature, in my opinion, is zero water wastage. 

The appliance ensures that there is no water wastage. It re-circulates the rejected water, pumping it to the overhead tank.

Though there have been complaints against this mechanism, we found it good when observed.

Besides, it gives you 100% pure water, with a multiple purification system, as the brand claims.

In addition, the Mineral RO technology, using the TDS control system, retains essential minerals in the water. 

Here, as observed when tested, the water purifier gives you alkaline water. The purifier increases the pH level of the water. The brand claims that it is essential for a healthy body and mind.

A notable aspect of the purifier is the presence of UV disinfection. It actually keeps the purified water pure for longer hours. As observed, it does so.

The purification capacity of the appliance is very good. Note that it purifies 20L/hr. Besides, the storage capacity is also good. It has a capacity of 8L.

The water purifier comes with many other in-built features. There is a Filter Change Alarm. It notifies you regarding the filter change time. 

The UV Fail Alarm alarms when the UV lamp gradually becomes inefficient.


  • Keeps the purified water pure for longer hours
  • Has a good storage capacity of 8L
  • Has a huge purifying capacity (20L/hr)


  • Some customers complained about the zero water wastage technology
  • Several hidden charges
Final Verdict:In short, it is a well-to-do water purifier. This RO water purifier is perfect for customers who would prefer drinking alkaline water and get benefits. Thus, for them, it is a good option to spend on.

6. HUL Pureit Advanced Pro Mineral RO+UV 7L Water Purifier

HUL Pureit Advanced Pro Mineral RO+UV 6 stage wall mounted counter top black 7L Water Purifier

Key Highlights:

Storage Capacity: 7 L
Purification: 6 stage purification
Special Features: 100% pure water,
Essential minerals, 1005 food-grade plastic,
Energy-saving mode

The next on our list of best RO water purifiers ranks the HUL Pureit 7L water purifier. The short review of this product begins with its 100% pure water. You get to drink water free from heavy metals, harmful viruses, and bacteria.

The water here is also enriched with the minerals (calcium and magnesium) like its other competitors in the market.

In addition, the brand claims the product to be 100% food-grade plastic. It restricts the harmful toxins from leaching the water.

The purifier comes with a 7L storage tank. 

The best part of this purifier which I loved the most is its energy-saving mode. Here, the purifier goes on stand-by when the tank is full. Note that when checked and observed, it was true to what the brand claimed.


  • Comes with energy-saving mode
  • Ideal for large families
  • Water tastes good


  • No TDS controller
  • Only the electrical parts fall under the warranty
Final Verdict:Overall, this product is a good one. It is ideal, especially for people who would prefer the appliance does not go heavy on their electricity bills. With its energy-saving features, you can be assured.
Also, if you are having a large family but you want a purifier that comes at an affordable price, this is the perfect one.
Thus, check your preferences and buy the one that is best for you.

7. Blue Star Excella EX4BLAM01 6 L RO + UV Water Purifier

Blue Star Excella EX4BLAM01 6 L RO + UV Water Purifie

Key Highlights:

Storage Capacity: 6 L
Purification: 6 stage purification
Special Features: Aqua Taste Booster,
Huge purification capacity, Copper impregnated,
Tank Full Indicator, Effective sediment removal

This water purifier from Bluestar comes with a 6 stage water purification system. It includes double-layered RO + UV protection. 

Here the RO removes dissolved impurities, ions. On the other hand, UV deactivates micro-organisms like viruses and bacteria.

Our research team tested and verified that the product is true to what the brand claims.

In addition, the Aqua Taste Booster is what I loved the most. It actually enhances the taste of the water and also maintains a balanced pH level of the water.

Another notable feature of this product is its purification capacity. The RO membrane here has a purification capacity of 285L/day. It is due to a super quality and efficient RO membrane.

This purification capacity has been tested. When observed, it could actually purify such an amount of water.

Note that the purifier comes equipped with copper-impregnated activated carbon. It is instrumental in smell, odor and also has antibacterial properties.

The sediment removal filter fitted to the purifier is very effective. It easily removes the finest particles, sand, dust, and mud from the water. 

The appliance comes with a Tank Full Indicator as well. It works perfectly, as observed.


  • ATB allows you to drink water with enhanced taste
  • The tank full indicator is a plus point
  • The huge purification capacity is an add-on
  • Get the benefits of copper


  • Wastes water
  • Hidden charges
Final Verdict: This water purifier is ideal for customers looking for something very effective yet which comes at an affordable price. Also, you can rely on brand value.
The Aqua Taste Booster is sure to attract those customers who have a habit of drinking water with a somewhat enhanced taste.
In short, it is a good appliance remaining true to the brand’s claim on the features.

8. LG WW182EP RO+STS+UV+UF (Mineral Booster) RO Multi-Stage Filtration

LG WW182EP RO+STS+UV+UF (Mineral Booster) RO Multi-Stage Filtration with 8 LTR. Dual Protection Stainless Steel Tank

Key Highlights

Storage Capacity: 8 L
Purification: 5 stage purification
Special Features: Stainless steel tank,
Flexible installation, 2 in 1 water solution,
Authorized filters, Digital sterilization

Here comes a water purifier from LG. It comes with a 5 stage RO filtration system. The water thus retains minerals and is pure. The LG Mineral Booster adds so, enhancing the taste and health of the water.

The purifier comes equipped with a dual protection stainless steel tank. Note that stainless steel tanks restrict the growth of bacteria and algae. Also, your water remains fresh. 

Our team has tested this feature. There was actually no growth of bacteria and algae. Therefore, it is true in actual practice.

In addition, the brand uses authorized filters. Our team has verified it.

Moreover, this appliance is easy to use with a smart display. Its flexible installation comes as an added advantage.

You can place it on the countertop or mount it on the wall.

One of the best features, according to me, is the 2 in one water solution. Here, you get to use a secondary valve. The water from this secondary valve allows you to wash vegetables. 

Though it claims that you can use this water to wash clothes, it is better to use it for cooking or washing fruits and vegetables.

Digital sterilization is a plus point of this purifier. The entire water path is sterilized without the use of any harmful kit.


  • Grab the benefit of two in one water solution
  • Enhances your kitchen look
  • Installation is flexible
  • Convenient to use


  • Maintenance is expensive
Final Verdict:In short, LG has brought in a great water purifier. It is the same in actual practice.
The product is ideal for people who would prefer a brand value and would not compromise spending some extra money.
Also, you can buy it if you are someone who would love to enhance their kitchen look. The water purifier has a very stylish design.

9. Eureka Forbes AquaSure from Aquaguard Delight water purifier

Key Highlights:

Storage Capacity: 7 L
Purification: 6 stage purification
Special Features: TDS controller,
Energy-saving mode,
Flexible installation

Our next water purifier in the list comes equipped with a TDS regulator that allows you to adjust the water’s taste. The water passes through 6 stage filtration. 

There is a large storage tank of 7L.

One of the best features of this purifier is that there is an energy-saving mode. The machine instantly switches off once the tank is filled. 

We have tested this feature, and the results are quite good. 

Also, you get an option for flexible installation. Either mount it on the wall or use it over the countertop.


  • Has a good storage capacity
  • Energy-saving mode is a plus point
  • It comes with a flexible installation option


  • Poor after-sale service
Bottom Line:This water purifier is an excellent one. However, it is ranked 9th as it has some limited features compared to others on the list.
However, people who are looking for water purifiers that are cheap and come with good features, this one’s for you.
Check your budget and decide.

10. Havells Max Alkaline 7-Liter RO+UV Water Purifier

Havells Max Alkaline 7-Liter RO+UV Water Purifier (Blue/White)

Key Highlights:

Storage Capacity: 7 L
Purification: 7 stage purification
Special Features: iProtect purification,
Several error alerts,
Alkaline water, Installation (flexible

The list ends with Havells. The water purifier offers you alkaline water. It comes equipped with a 7 stage purification system. It has 100% RO and UV purification.

The best part of the water purifier, according to me, is that it comes with iProtect purification. It is instrumental in cutting off the water if it is unfit for drinking. 

Also, it was checked and verified by our team.

The water purifier even alerts you if there is a low water pressure or tank full. Also, it notifies you during a pump failure. In addition, it gives you the error alerts for UV and SV.

Note that these features are checked and verified by our team. 

You can even mount the appliance on the wall or keep it on the countertop.


  • The water purifier alerts you for several reasons
  • You get the option for flexible installation
  • iProtect purification is an add-on


  • The alkaline water is not natural here
Bottom Line:The inbuilt features make it an ideal appliance for this list of best RO water purifiers. It comes at a reasonable price. Therefore, check out the features.

Best Water Purifier For Home – Buying Guide

The another name of water is ‘life’. Because just like air we cannot think about living without water. And we are blessed that our earth has sufficient water for all the life present in the planet.

But, we humans are polluting this precious source of life with different means. We are either doing it directly or indirectly, and we are doing this at an alarming rate.

water pollution
“Phosphate plant in Atlantic, Morocco.”

Low access to drinking water, along with inadequate sanitation and hygiene conditions, are the leading causes of waterborne diseases, which produce approximately 1.8 million deaths annually worldwide.

The supply of clean water through centralized systems is a difficult task in developing countries. These large-scale systems involve massive operation and maintenance efforts.

And there is always the risk of re-contamination of drinking water during the distribution, and management processes in the place of consumption (homes, schools, offices etc.).

Therefore, water treatment at the domestic level through the use of simple and useful options can significantly reduce the incidence of waterborne diseases.

Polluted water
Human made polluted waters

The water can be purified by boiling, chemical treatment with chlorine, or iodine, or acquiring the best water purifier for home.

Due to the presence of pathogens such as bacteria, and protozoa, and toxic substances such as heavy metals, contaminated water is capable of endangering the health of the population.

This water should not be used for human consumption, or even for recreational purposes.

Causes Of Water Pollution

There are different sources of water pollution, which lead to the poisoning of water. We do not realize, but we humans are responsible for polluting the purest source that we have.

Dumping of industrial waste into the river
Dumping of faecal sludge into the river scaled

Water pollution is the impurities present in the water which makes it harmful for any living being. Water gets polluted when it is mixed with chemicals, plastic waste, and any other negative discharge.

It happens due to many reasons such as dumping of industrial wastes, sewage water discharge, littering plastics in water, disposing garbage, using pesticides, chemicals from factories, liquid waste, and so on.

Impurities In Drinking Water

Water is an excellent solvent, and therefore, it can dissolve anything that comes in contact with it. Once you are aware of different types of impurities, you must know what impurities does drinking water has.

impurities in drinking water
Impurities in drinking water

There are mainly four types of impurities present in water.

  • Dissolved Impurities: The natural water consists of of inorganic salts, dissolved organic matter, and gasses.
  • Suspended Impurities: The surface of water consists of organic suspended pollutants such as animal body material, oil globules, and vegetables. On the other hand, the inorganic suspended impurities consist of sand, clay, and eroded minerals.
  • Colloidal Impurities: It includes clay, organic waste products, amino acids, coloring materials, and silica.
  • Pathogenic Micro-organisms: It includes bacteria, algae, fungi, viruses etc.

To remove all these impurities you need the best water purifier with latest technologies such as an RO water purifier.

Total Dissolved Solids (TDS) in Drinking Water

You may have heard about TDS, but what is this actually? TDS is the combined content of all inorganic and organic substances present in a water in molecular, ionized or micro-granular suspended form.

Examining TDS in the water
Examining TDS in the water

The primary sources of TDS in water are minerals-rich mountain waters, leaching of soil contamination, agricultural runoff, residential runoff and point source water pollution discharge from industrial or sewage treatment plants.

These solids include calcium, phosphates, sodium, potassium, nitrates, and chloride. Also it includes heavy metals like mercury, lead, cadmium, arsenic etc.

Heavy metals in water
Heavy metals in water

These are extremely harmful for our health. These heavy metals does not get removed from our body and it keeps on accumulating there.

They cause serious health problems including cancer, severe nerve diseases or people may even die.

Acceptable TDS Level:

  • TDS Below 300 – Excellent for human consumption.
  • Between 300 to 600 – Considered suitable for drinking purpose.
  • TDS Between 600 to 900 – Water is fair and acceptable.
  • Between 900 to 1200 – Poor and unacceptable.
  • Above 1200 TDS – Water is unfit for consumption.

Different Types of Water Purifiers

Purifying the drinking water needs a water purifier. Fortunately, we have a variety of water purifiers. Here, we are going to discuss the different water purifiers. 

RO Water Purifier

The RO is basically Reverse Osmosis. This is a special technology that is instrumental in removing heavy metals like arsenic, lead. 

Here the water passes through a semipermeable membrane. It removes fluoride, nitrates, and other salts and impurities. 


  • Easily treats water with higher TDS
  • Removes heavy metal impurities
  • Ideal for hard water
  • Comes with a good storage capacity


  • The problem of water wastage
  • Fails to kill germs and bacteria
  • Requires an expensive maintenance

Ultrafiltration Water Purifier

Here, there is a use of ultrafiltration membrane for purifying water. These come with larger pores compared to the RO membrane. It is capable of restricting germs and bacteria.


  • Works without electricity
  • Easily removes germs and bacteria
  • Filters are long-lasting
  • Manual cleaning makes maintenance easier


  • Fails to treat water with high TDS
  • Fails to remove heavy metals and salts

Ultraviolet Water Purifier

From the name, it is evident; the purifier here uses ultraviolet radiation to remove germs and viruses. Thus, this purifier is ideal for making the water free from harmful microorganisms. 

These harmful microorganisms are capable of causing serious diseases like cholera, dysentery, typhoid.


  • Removes water-borne disease-causing bacteria and viruses
  • It does not use chemicals thus, maintains the taste of water
  • There is no such wastage of water
  • Minimal maintenance cost


  • Fails to remove dissolved salts and impurities

Basic-candle Water Purifier

This is used in households and is the simplest form. The set-up consists of one or two candle or sediment filters. These are instrumental in trapping visible impurities.

Note that it cannot trap impurities that are smaller than candle pores. Also, it cannot prevent microbes; it is better to boil the water before consumption.


  • Easy and simple to use
  • Easily available
  • Inexpensive


  • Cannot remove microbes
  • You need to change the candle at frequent intervals

Gravity-based Water Purifier

Here, the filter works on a principle where water moves from a higher chamber to a lower chamber. It is due to the difference in pressure.

It basically comes equipped with filters like germ filters and micro-filters which traps dust particles and dissolved salts.


  • Inexpensive
  • Has a good storage capacity
  • Portable
  • No requirement for electricity
  • Simple and easy to use


  • Fails to filter high concentration TDS water
  • Does not eliminate microorganisms and heavy metals

Multi-stage Water Purifier

From the name, it is evident that these purifiers come with a combination of several. The water purifiers, as mentioned above, have some cons. Thus, these multi-stage water purifiers are instrumental in removing the disadvantages of each of the water purifiers.

Here are its procedures and features.

RO+UV: This combination ensures no germs, viruses, bacteria, heavy metals, dissolved salts.

RO+UV+UF: This combination includes an extra stage of purification. It is UF. Therefore, along with the advantage of RO+UV, you get the benefits of UF. Thus, the purified water is free from high levels of TDS.

Pre and Post Activated Carbon Filter: These are instrumental in absorbing toxic chemicals (Arsenic, pesticides). Also, they improve the odor of the water. 

Another notable benefit is they block the impurities from sticking to the RO membrane. Thus, it increases the lifespan of the RO membrane.

In the modern day, you get a combination of these purification stages. Thus, you are able to drink pure water.


  • Treats hard water
  • Removes germs, bacteria, dissolved salts, viruses, heavy metals
  • Enhances the taste of water with some minerals


  • A constant electricity supply is necessary
  • A very high maintenance cost

Advantages of Water Purifier

There are a number of benefits of using a water purifier. 

  • Purified water is good for our health. As our body consists 80% of water. Therefore, it is essential to drink pure water.
  • It slays Alzheimer’s disease. An excess of aluminum in drinking water leads to Alzheimer’s. Water purifiers eliminate aluminum.
  • Having a water purifier saves the environment. When you buy plastic bottles of pure water. It leaves behind an environmental hazard as plastic is dangerous. Also, having a water purifier reduces carbon emissions. As your water is being carried by vehicles.
  • It also saves money. You do not have to buy water bottles. Though a water purifier is costlier than a bottle of water, you save a lot of money in the long run.
  • It removes bacteria (specially RO or UV purifiers).
  • It is better than boiling water. Also, it saves time and is an easier way to purify water.

Disadvantages of Water Purifier

There are a lot of advantages of a water purifier. However, it comes with some disadvantages as well. 

  • Water purifiers result in wastes. The discarded filters add up to wastes. In addition, the impurities removed from the water do not end up being disposed of properly.
  • The water purifiers, especially the RO and UV, rely on electricity that often comes from coal-powered plants. Thus, it contributes to carbon emissions.

Technologies Used in The Best Water Purifier

Sediment Filter

This is the first level of purification. This filter removes all the large impurities and dust particles from the water. It is used only in places where the water contains a lot of pollutants.

Pre-Activated Carbon Filters

It efficiently removes the organic chemicals and pesticides from water which are responsible for bad order and improves the taste of the water.

Reverse Osmosis Mechanism

In this process, the water is passed through a semi-permeable membrane. It allows the movement and flow of molecules of water but doesn’t dissolve salts, bacteria, and organics.

Reverse Osmosis

As the water cannot move from low concentration to high concentration, a motor is used.

After that, the water is divided into two parts; the dirty water is sent down to the drainage, and the clean water is sent for the next step of its treatment.

Ultraviolet Protection

Ultraviolet purification
Ultraviolet purification

In this chamber, the water in the RO filter is filtered again. As the RO membrane cannot separate the particles which have the molecular mass of less than 20 it may contain virus, bacteria and other micro-organisms in it.

So, the water is treated with the ultraviolet rays, and all the viruses and the bacteria are killed. The water is made 100% pure after this step is completed.


Ultra Filtration
Ultra Filtration

Under this process, the water is passed through the membrane, and all the residual particles that are still left in the water are removed out as this membrane has minute pores, and all the left particles are separated.

Difference Between RO vs UV vs UF Water Purifiers

Attributes RO (Reverse Osmosis) UV (Ultraviolet) UF (Ultrafiltration)
Filtration Cleans all the Germs and Microorganisms from the water Eradicates all the Germs and Microorganisms but they couldn’t remove their dead cells Cleans all the Germs and Microorganisms from the water
Working Electrical energy is required to pump the water pressure Works with the reasonable power of water Works with the force pressure of water
Purification Electrical energy is required to purify Electrical power is needed to purify Does not require any electricity
Membrane Yes No Yes
Impurities Removes all the dirt including dust, sand, etc Does not filter the impurities Removes all the dirt including dust, sand, etc
Dissolved Solids Lower the level of substances by 90 percent Do not reduce the absorption of substances Do not cut the concentration of substances

Read: RO vs UV vs UF Water Purifiers

TDS Controller

When the water is passed through the Reverse Osmosis membrane, it separates all the dissolved solids from the water. In the process it removes some important minerals which are essential for the growth of our body.

The TDS controller separates the input water into the two parts A and B. 

A part is passed through the RO process, and part B is passed through the UV/UF. So, part B contains the necessary minerals.

And after that, both the parts are mixed to maintain the pH value of the water, thus makes it healthy to consume.


It improves the quantity of the minerals in the water as the part of water passed from the RO process is the lack of minerals. Also the input water always does not contain all the necessary minerals in it.

So, it is necessary to add the minerals back. Mineraliser adds the minerals back to the water and makes it healthy to consume.

Things To Consider Before Buying The Best Water Purifier For Home

Check For TDS

You should always test the water source at your house before selecting the type of water purifier. You can check the TDS level of water by using a TDS meter.

Pen type digital TDS meter
Pen type digital TDS meter

If the water is supplied from river, lake or municipal corporation, and has TDS level between 0-200 ppm, consider a UF or UV water purifier.

And if the source is bore well or tube well and has TDS anywhere between 200 – 2000 ppm, then consider an RO water purifier to safeguard the health of your family.

If in doubt, you should always go for the best, i.e. the RO + UV + UF water purifiers.

Quality of Reverse Osmosis

Before entering the subject, it is essential to let you know the importance of the variety of this equipment.

As there are a few companies that offer water purification with RO facility but, their low price reflects on their abilities.

These low price products are not only based on inferior quality, but they are also based on the absence of accessories, and the quality of them.


The membrane also suffers from this loss of quality and affects us directly. We must not forget that the right or lousy purification of the water depends on it.

We cannot take any risk to save a few rupees. It is better to opt for a genuine quality RO water purifier than drinking the unhealthy water every day.

This will be killing us every day little by little.


Buy one that is cost-efficient and provides the best services while being within the limits of your budget. You should remember that water purifiers require regular maintenance and replacement of filters.

Therefore, you should choose it wisely so that is suits your budget.

Not Time Consuming

You need to make sure that the water purifier purifies the water in little to no time. So that you don’t have to wait to quench your thirst.

User Friendly

You need to choose a water purifier that is easy to operate and work with.

Warranty And After Sales Service

Water purifier requires regular servicing to give you 100% pure water.

Therefore, you should always choose a brand that provides good after sale service.

A reputed brand is known for their product as well as their after sale service. They also give you good warranty and satisfactory service in case of breakdown.

Alert System

Your RO water purifier should have fail alert system. This will let you know if there is any problem in the purification process.

It will indicate in situations like the filters need to be changed or the UV light is not working.

This will ensure you 100% pure water all the time.

Points to Note when Cleaning a Water Purifier

  • Check the manual before cleaning..
  • Turn off the purifier first, then open the purifier.
  • Ensure that the main valve is also off.
  • Empty your storage tank before you clean the purifier.
  • You must fill up the tank twice after you change a filter or clean the filter.

Note: Check our article on ‘How to Clean RO Water Purifier at Home – A step-by-Step Guide!

two glass of water on table

Best RO Water Purifier in India – Frequently Asked Questions (FAQs)

1. What is night assist?

Night assist is a feature that you will find in several RO water purifier brands. With the night assist feature, the water purifier gets illuminated at night.

The night assist technology gives you the convenience of filling a glass of water in the midnight. 

2. What is SCMT?

SCMT is an advanced stage of water purification that you will see in some of the best RO water purifiers.

This water purification process helps to prevent secondary microbial contaminations, thereby ensures pure and healthy water. 

3. How much energy does a water purifier consume?

The amount of energy consumption differs according to RO purifiers and UV purifiers. Usually, the average power consumption of a RO purifier is about 25 watts.

It means if a family drinks 15 litres of water every day then a 25 watt machine with purification capacity of 15 ltrs/hr will cost you about 9 units per year.

25 watts * 365 days = 9125 watts = 9 units (approximately)

Though this amount of power consumption varies according to various models.

Kent RO water purifier with UV light consumes 60 watts of electricity per hour which will cost you just above 22 units per year.

And the UF water purifiers do not require electricity to run.

4. Can the water purifier conserve the rejected water?

Yes, It’s possible to conserve the rejected water. But during the purification process, water purifiers discard a massive amount of water due to the presence of lots of harmful excrement.

It can purify only 20% of the water. But now these days, many advanced purifiers can filter and conserve almost 50% of the rejected water.

5. Does RO Water Purifier enhance taste?

There are specific questions, even doubts that many people have regarding the taste of water. RO purifiers extract the vital minerals from water and leave it tasteless.

That is why some of the best water purifier brands such as KENT and many more come with mineral RO technology. It conserves vital or necessary minerals in water and also offers tasty potable water.

6. How much charge will it take for the maintenance of a RO purifier?

In comparison with UF and UV water purifiers, RO water purifiers have higher maintenance costs.

RO water purifier maintenance costs are quite high because it includes many filters along with the RO membrane. This membrane is very expensive.

The RO water purifier’s average maintenance cost is between 3000 to 5000 rupees annually.

7. What is the difference between purified water and bottled mineral water?

Whereas purified water is pure along with impurities, and it is contaminants free, mineral water is a form of fresh filtered water.

Purified water is filtered and processed by a purification method to make purified water clean and healthy.

Many types of impurities, such as pesticides, chemicals, bacteria, fungi, algae, even metals like lead and copper, are removed through this purification process.

The process of water purification, such as RO, UV, UF, ensures complete contaminant-free water for drinking.

On the other side, mineral water is purified by the addition of minerals. It’s supposed to be extracted from natural springs.

But, unfortunately, it is nothing but regular water with inorganic minerals.

8. For how much time I can store the water in a water purifier?

To stay healthy and hygienic, the stored water should be replaced every two days. The storage tank itself helps to propagate microorganisms.

So it requires frequent usage and exchange of water from the storage continuously.

9. Why is it necessary to remove the dissolved impurities from the water?

Water has such harmful impurities that we can not visualize with our open eyes, and those excrements can not be removed through the boiling process.

Boiling destroys microbes and pathogens but does not eliminate all dangerous impurities such as Arsenic, Cadmium, Lead, Iron, Fluoride and other heavy metals.

The presence of such excrement in water causes harmful diseases, including hepatitis A & B, jaundice, cholera, typhoid and cancer as well.

10. When should I go for cartridge change?

The indicator glows to show the outcome of the respective update when the cartridge hits 90% of its life.

Moreover, the purification process will be stopped when it reaches 100 percent of life, and it will require a new cartridge.

Best Water Purifier in India – Final Words!

We hope the list was compelling enough to choose the best water purifier in India among them.

best water purifier in india 2021

But if you feel you need something else then you can follow the buying guide and get the right product purchased.

Do not forget to make any queries related to this article. We are just a comment away from you.


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15 thoughts on “Best RO Water Purifier For Home In India 2021 – Buyer’s Guide & Reviews!”

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