8 Best Water Purifiers in India (2020) – Reviews & Buyer’s Guide

| |

“Thousands have lived without love, not one without water”. This age-old adage by W.H.Auden accurately specifies the importance of water for existence.

Children whining about a stomach ache that too merely after consumption of water is a common sight. What’s more, adults also suffer from a lot of water-borne diseases these days. All this is because of soaring pollution that has made the potable water unfit for consumption.

So, for one to feel like a million, a water purifier is definitely the need of the hour.

There are certain important factors that need to be taken into account while buying the best water purifier for your home. Read our buying guide at the end of this article to learn the ropes.

Our list of 8 Best Water Purifiers in India(2020) right below will ease your job to put the seal on simply the best product.

Best Water Purifiers India

KENT New Grand 8-Litres RO + UV+ UF + TDS Water Purifier

KENT New Grand 8-Litres Wall-Mountable RO + UV+ UF + TDS (White) 20 litre/hr Water Purifier

Key features

  • Multistage water purification technology with RO + UF/ UV
  • Suitable for all types of input water
  • Inbuilt TDS controller with patented mineral RO technology
  • More than 1500 service centers across the country
  • Storage capacity: 8 litres; Purification capacity: 20L/ Hr
  • 1 year warranty, and 3 years of free service

Kent New Grand Water Purifier is undoubtedly the best water purifier available in India right now.

The water purifier comes equipped with multistage RO + UV/ UF purification technology. As a result, it can remove all kinds of input water impurities like chemicals, metal toxins, bacteria, viruses, microorganisms etc. The purified water is healthy and safe to drink.

Built in TDS controller and the Kent’s RO TM technology make sure that the natural mineral lost during RO purification are restored. This makes sure that the purified water has all the necessary minerals and a great taste. The TDS controller has been covered in detail in the buying guide. Make sure you check that out to decide between a TDS controller and a mineralizer.

Kent water purifiers comes with a Pan India service network of 1500 service centers all over India. This makes it extremely easy to get in touch with a service professional for water filter maintenance service needs.

The purifier also features a huge storage tank of 8 litres. It also has a high purification capacity of 20L/hr which makes sure that you get continuous supply of purified water. Other notable features of this water purifier include Save Water Technology and Water Level Indicator.

To summarize, you can never go wrong with the purchase of Kent New Grand Water Purifier.

Pros
  • Best water purifier available in India
  • Removes all kind of impurities including bacteria, viruses, micro-organisms etc
  • Good storage capacity of 8 litres
  • Pan India Service Network with 1500 service centers
  • Suitable for all types of input water
  • TDS controller with patented mineral RO technology
Cons
  • Comes with RO technology which wastes a lot of water
Buy from Amazon

Havells Max RO+UV Water Purifier – 8 liters

Havells RO+UV Water Purifier - 8 liters

Key features

  • 7 stage purification using RO+UF technology
  • Mineralizer cartridge for correcting pH and restoring natural minerals
  • Revitalizer for improving hydration and mineral absorption
  • Suitable for all kinds of water sources having any sorts of impurities
  • Protection from voltage fluctuations
  • Smart alerts for tank full; UV, SV or pump failure
  • Storage capacity: 8 litres
  • 1 year warranty from the manufacturer

Havells has recently emerged out to be a reputable brand for water purifiers in India. Havells Max is one of the latest water purifiers with the reverse osmosis technology.

With the RO+UV water purification, 100% of water passes through the RO membrane and then UV protection in 7 stages of purification. This is different from a lot of other water purifiers with TDS controller, where only part of water flows into the RO membrane to preserve the natural minerals. Rest of the water is only partially filtered using UV membrane.

Since, 100% of water passes through the RO membrane, this water filter provides superior water purification compared to the other water purifiers.

As also discussed in detail in the buying guide, the RO technology also removes all the natural minerals of the water. To address this problem, the water purifier comes with a mineralizer cartridge. The cartridge in addition to correcting the pH of the water, also adds back all the natural minerals to the water. This results in healthy and tasty purified water. This water purifier also comes with a revitalizer. The revitalizer activates the water molecules to improve the hydration and mineral absorption of the water, and hence making the water healthier.

The water purifier comes with a smart alert system. There are alerts for purification and tank full, and error alerts for UV, SV or pump failure. Yes another advanced feature of the water purifier is the zero splash faucet ensuring smooth flow of the water with no splash.

Pros
  • 100% of water passes through the RO and UV membrane providing superior purification
  • Mineralizer cartridge to correct pH and restore essential minerals
  • Revitalizer activates the water for better mineral absorption
  • Smart alert system for purifier errors
  • Zero Splash Faucet
Cons
  • Lot of water wastage due to RO technology

Buy from Amazon

HUL Pureit Marvella RO+UV+MF+MP Water Purifier

HUL Pureit Marvella RO+UV+MF+MP Water Purifier

Key features

  • 7 stages of advanced purification using RO+UV+MF+MP
  • 100% RO purified water ensuring no mixing of purified and impure water
  • Mineral cartridge for replenishing lost minerals during RO stage
  • Advanced voltage fluctuation guard
  • Suitable for water with TDS level upto 2000 ppm
  • Storage capacity: 8 litres
  • 1 year warranty from the manufacturer

The HUL Pureit Marvells uses an advanced 7 stage water purification process which ensures 100% pure and healthy drinking water. It ensures that the excess TDS is removed and the water is cleared of all the impurities. The 7 stages of purification are:

  • Pre-Sediment filter: Visible dirt and impurities are removed
  • Membrane protector: Removes bad odor and organic compounds, enhances life of RO membrane
  • Mini filter: Further filtration to remove finer particulate impurities
  • RO Membrane: Removes hardness, dissolved salts, heavy metals and microbes like bacteria, viruses etc
  • UV chamber: Additional stage of purification which destroys viruses, bacteria and parasites
  • Micro filtration: Purifies the water of any remaining impurities
  • Post RO carbon filter: Adds essential minerals and enhances taste
The water purifier ensures that the 100% of water passes through the RO membrane and no mixing of pure and impure water is done. This is in contrast to the water purifiers which come with the TDS regulator. The lost minerals like Calcium and Magnesium are replenished by the mineral cartridge.

The Marvella Sleek has a very compact and aesthetic design. It also features a large storage tank with a capacity of 8 litres which makes sure that you never run out of pure water.

Yet another advanced feature of this water purifier, is the filter change alarm which alerts for the filter change with the red indicator on the front panel. This is useful so that you are always 100% protected and only drinking safe and healthy water.

Pros
  • Advanced 7 stage water purification using RO+UV+MF+MP
  • 100% water gets purified using RO membrane
  • Mineral cartridge for adding essential minerals and enhancing taste
  • Filter change alert
  • Large water tank capacity of 8 litres
Cons
  • Wastes a lot of water like other RO filters
Buy from Amazon

AO Smith Z9 RO+SCMT 10Litre Water Purifier

AO Smith Z9 RO+SCMT 10Litre Water Purifier

Key features

  • Advanced 8 stage water purification using RO+SCMT
  • 100% RO purified water ensuring no mixing of purified and impure water
  • Mineraliser Technology to add essential minerals to the water
  • ART (Advanced Recovery Technology) ensures minimal water wastage
  • Purified hot water at click of a button
  • Night assist to locate water purifier in dark
  • Advanced alerting system for RO membrane change or filter change
  • Suitable for water with TDS level upto 2000 ppm
  • Storage capacity: 10 litres
  • 1 year comprehensive warranty – includes all filters and RO membrane

The AO Smith Z9 is a complete solution if you are looking for an ultramodern, best in class RO water purifier. This water purifier has the most advanced features among all the RO water purifiers available in India right now.

It comes with an advanced 8 stage water purification process which is capable of purifying water from all type of input sources. As you would have guessed, the water purifier doesn’t have TDS regulator, 100% of the water passes through the RO membrane and is double purified by SCMT. This process makes sure that each and every drop is purified of all the impurities.

RO purification results in loss of all the natural essential minerals of the water. The water purifier comes equipped with mineraliser technology which adds back all the natural minerals to the water. This ensures that the water tastes good and has a balanced pH.

The purifier also features an Advanced Recovery Technology (ART), this saves 2X more water compared to other water purifiers. The Z9 also has smart alert system to alert if RO membrane or any of the filters need to be changed. Hence, you don’t need to worry about the purity of the water, ever.

Another very important feature of the water purifier is the dedicated hot water faucet. The purifier comes with two different faucets, one for normal water and the other one for hot water. The hot water temperature can be adjusted to 45 degrees or 80 degrees.

Although, the water purifier is a bit expensive, but that is because of the advanced features it has to offer. If budget isn’t a constraint for you, then look no further, AO Smith Z9 is an amazing choice.

Pros
  • Advanced double purification using RO and SCMT
  • 100% water passes through the RO membrane providing superior purification
  • Mineraliser for replenishing the natural minerals
  • ART (Advanced Recovery Technology) ensures less water wastage
  • Purified Hot water on click
  • Advanced alerting for RO membrane or filter change
  • Huge storage capacity of 10 litres
  • Night assist
  • Ultra-modern design
Cons
  • Price is high
Buy from Amazon

Kent Pearl 8-Litre Mineral RO+UV+UF

Key features

  • Multistage purification technology of RO+UV+UF+TDS
  • TDS controller with patented mineral RO technology
  • PAN India service network of 1500+ service centers
  • Suitable for purifying water from all sources
  • Smart alarm feature for UV failure and filter change
  • Large storage tank with 8 litre capacity
  • 1 year warranty, and 3 years of free service

The Kent Pearl is another stylishly designed water purifier from Kent. The Kent pearl comes with a multistage purification process of RO+UV+UF+TDS. This means that you don’t have to worry about any dissolved impurities, bacteria, viruses, or other contaminants anymore.

The water purifier also comes with an inbuilt TDS controller with patented mineral RO technology. It helps in maintaining the essential minerals in the water, also ensures that water is safe to drink and has a great taste.

Kent is one of the most trusted water purifier brand in India and has a Pan India Service network of more that 1500 service centers. So, you get nothing less than prompt service with dedicated and trained service professionals.

The purifier also comes with smart alarm features. There’s a UV failure alarm alert when the UV lamp becomes inefficient. This is especially useful because the UV failure can go unnoticed in most of the other purifiers, and thus allowing harmful bacteria inside the water. Also, the time based filter change alarm, alerts the users to change filters.

If you are looking for a reverse osmosis water purifier, then this purifier stands tall among the competitors. With Kent’s technology and trust, this is one of the best buys.

Pros
  • Multistage purification with RO+UV+UF+TDS
  • TDS controller for retaining essential minerals
  • Suitable of purifying water from all sources including municipal water, tap water etc
  • Pan India Service network of 1500+ service centers
  • Smart alarm features
Cons
  • Wastes a lot of water due to RO technology
Buy from Amazon

Eureka Forbes Aquasure from Aquaguard Delight 7-Litres RO+UV+MTDS

Key features

  • Multistage purification with advanced RO+UV+MTDS technology
  • TDS regulator for manually adjusting the taste and TDS of water
  • LED indicators for showing power on/ off, purification on/ off and tank full status
  • Smart energy saving mode
  • Storage capacity: 7 litres; Cartridge Life: 6000 litres
  • 1 year warranty from the manufacturer

The AquaGuard delight , is a sleek and compact water purifier. It comes equipped with an advanced TDS controller (MTDS), allowing you to adjust the taste of water as per the input source. The water purifier can be used to treat water with TDS of upto 2000 PPM.

The advanced multistage purification with RO+UV+MTDS ensures that the water purifier gives nothing less than 100% pure and safe drinking water. The different stages of water purification utilize the Sediment Filter, ChemiBlock, MTDS, RO membrane, mineral cartridge, and the UV chamber.

The other notable feature of this water purifier is the smart LED indicators. The indicators can indicate status like Power on, purification on and tank full status. Another smart features is the Energy Saving Mode. This switches off the power supply once the water tank is full.

This water purifier is a strong competitor in the market among the RO water purifiers. It’s also backed up by a best in class after sales service from AquaGuard.

Pros
  • Advanced multistage RO+UV+MTDS purification technology
  • Smart MTDS to restore essential minerals and adjust taste of water according to need
  • Sleek and compact design
  • Smart energy saving mode
  • LED indicators for showing different status
  • Large 7 litres storage tank
Cons
  • The power adaptor is big and needs to be fitted outside the filter body
Buy from Amazon

Eureka Forbes Aquasure from Aquaguard Smart Plus RO+UV+MTDS

Eureka Forbes Aquasure from Aquaguard Smart Plus RO+UV+MTDS Water Purifier,Black

Key features

  • 6 stage water purification through RO+UV+MTDS
  • Suitable for all water sources like borewells, taps, wells etc
  • Smart TDS regulator maintains essential minerals
  • Smart plus for voltage fluctuation damage protection
  • Storage capacity: 6 litres; Cartridge Life: 6000 litres
  • Smart color indicators for tank full/ low water pressure/ no water supply/ error with machine
  • Comes with 1 year of warranty from the manufacturer

The water purifier features a 6 stage purification technology ensuring that the water is purified of all the input impurities:

  • Clarity cartridge: Removes large suspended impurities like dirt and sand
  • Chemi Block: Removes organic impurities and eliminates bad odor
  • Membrane life enhancer: prevents scaling of dissolved calcium and magnesium
  • RO cartridge: Removes TDS, hardness, heavy metals like lead and mercury
  • Taste enhancer cartridge: Replenishes the essential minerals and restores the taste
  • UV disinfectant chamber: Removes waterborne diseases causing bacteria, making it safe to drink

The water purifier comes with color changing light indicators. Using different colors, the indicators highlight the purification process, full tank, low incoming water pressure, no water supply, and error with the machine.

The cartridge comes with a long life of 6000 litres which provides a hassle-free yearlong protection. The smart TDS regulator replenishes the essential minerals lost during the RO process. This ensures that the output water is tasty and safe.

The water purifier also comes equipped with smart features like voltage fluctuation protection and automatic power off when tank is full.

In all, this water purifier provides good value for money. If you are looking for a RO water purifier with smart features, this water purifier should definitely be on your checkout lists.

Pros
  • 6 stage superior water purification through RO+UV+MTDS
  • Attractive price
  • Smart TDS control for taste adjustment based on source of water
  • 6000 litres cartridge giving year long of protection
  • Protection from voltage fluctuations
Cons
  • Water wastage due to RO technology
  • Power adaptor and a filter sit outside the water purifier body
  • Might require a booster pump is water pressure is low
Buy from Amazon

Livpure Glo 7 litres RO+UV+ Mineralizer Water Purifier

Livpure Glo 7 litres RO+UV+ Mineralizer water purifier, White

Key features

  • 6 stage advanced water purification using RO+UV
  • Mineraliser for replenishing lost minerals during RO filtration
  • Suitable for purifying water from all sources upto a TDS level of 2000 ppm
  • LED indicators for power on, purification on, and tank full
  • Storage capacity: 7 litres
  • Comes with 1 year of warranty from the manufacturer

This water purifier from Livpure is one the most budget friendly RO water purifier in India right now. The purifier comes with and advanced 6 stage water purification process. The purification stages include Sediment Filter, Pre Activated Carbon Filter, RO Membrane, UV chamber, silver impregnated post carbon filter, and mineralizer.

The water purifier also comes with a mineralizer which replenishes the essential minerals. This makes sure that the water is healthy to drink and has a great taste.

The Livpure Glo has other useful features like smart LED indicators for power on, purification on, and tank full status. The system also switches off automatically once the tank is full.

Pros
  • Advanced 6 stage water purification using RO and UV
  • Most budget friendly purifier
  • Minerliser for replenishing lost minerals during RO
  • Comes with smart LED indicators
Cons
  • Wastes a lot of water like other RO purifiers
Buy from Amazon

Best Water Purifier – Buying Guide

Pure and healthy water is a basic need of every household. With increasing water pollution, finding the best water purifier based on the source of input water becomes all the more important.

best water purifiers in India - Buying Guide

Sources of water pollution

Drinking water is the most valuable resource for human existence. Having clean drinking water is critical need as well. Yet, the earth’s supply of fresh drinking water is depleting. It is estimated that every year unclean water makes a billion people ill and kills 1.8 million.

Water pollution occurs when harmful toxic substances like pesticides, agricultural wastes, industrial wastes including heavy metal impurities like lead, arsenic etc enter the water. These impurities deteriorate the water and increase the TDS of water making it unfit for drinking. Water pollution is not isolated to only surface water. The harmful contaminants can seep through the soil into the ground and thus making the ground water polluted as well.

Source of water pollution

Usage of excessive chemicals in agriculture is one of the primary contributors to ground water pollution. Besides, the usage of pesticides in farming has extensively increased. The pesticides contain harmful chemicals and metals impurities including sulphur, lead, etc. These contaminants seep in through the soil into the groundwater, and thus making it polluted.

The surface water primarily comes from rivers, oceans, lakes, ponds and streams. When the water runs off from the snow-capped mountains, it collects salts and minerals from the rocks and sand. This contributes to the part of TDS (total dissolved solids) to the surface water. In addition, there are farm wastes and fertilizer run-off which includes phosphates and nitrates. This is one of the major contributors to surface water pollution.

The municipal and industrial water discharge contribute their fair share to the surface water pollution as well. This results in harmful metals like mercury, lead, arsenic, sulphur, etc. getting added to the water making it hazardous for drinking purpose.

The choice of water purifier depends on type of impurities present in the drinking water supply. The usage of correct water purifier can make sure that you can safeguard your family against all of these harmful contaminants in the drinking water.

Types of contaminants in drinking water

Depending upon the different sources of water, there are various impurities that the potable water comes immersed with. Some of these contaminants might be visible to the human eye while others are indiscernible.

Groundwater being the most common source of drinking water holds impurities like mud, sand etc. The other undetectable impurities found in water from borewell are dissolved salts like calcium, magnesium etc. Some hazardous chemicals like Arsenic, Mercury, Flouride, lead etc that come dissolved in water can pose serious threat to human life.UV+RO purifiers are beneficial in removing such type of impurities.

Various water-borne diseases such as typhoid fever, dysentery, diarrhea, cholera, etc are caused due to microbial contaminants found in drinking water. Few of these impurities are bacteria, cysts, protozoa, and viruses.

In order to make water drinkable, it is treated by municipal corporations using chlorine, a common disinfectant. But when it is used in large quantities, it leaves a bitter taste and a pungent smell which is detrimental to human health.

So, in order to ensure good health, one must have a water purifier to get rid of these impurities. Purification technologies such as RO, UV, and UF or a combination of these can immensely help in clearing out these contaminants from water and making it safe to consume.

What is TDS in water and why you should measure it?

What is TDS?

TDS stands for total dissolved solids, it represents the concentrations of the dissolved substances in water. The dissolved substances are made of organic and inorganic matters including metals, minerals and ions. TDS in water can be accumulated from various sources like spring minerals, rocks, chemicals produced from factories, fertilizers in farms, drainage pipes, runoff on roads, water supply pipes etc.

Why do you need to measure TDS?

Water with high amount of TDS can have harmful substances like lead, arsenic, copper etc . These substances can have serious health hazards if consumed without purification.

Increased amount of dissolved solids can produce hard water which can leave deposits on surfaces, utensils, fixtures, pipes etc. Hard water causes water filters to wear out sooner.

Also, on the other hands, water will extremely low TDS can be void of essential minerals like magnesium and calcium. Water with extremely low TDS also has a flat taste, which is unacceptable for many.

Therefore, it is important to determine the TDS of water before deciding on what kind of water purifier is needed.

What is an acceptable TDS level?

  • Less than 50: Unacceptable; because it is void of essential minerals
  • Between 50 – 300: Excellent for drinking
  • In range of 300 – 600: Good
  • Between 600 – 900: Fair and acceptable
  • In range of 900 – 1200: Poor and shouldn’t be used from drinking
  • Above 1200: Unacceptable and might have health hazards

How to measure TDS?

The easiest way to measure the TDS of water is using a TDS meter.

TDS meter is a small hand held device which can be dipped in water to check the water TDS. Since the dissolved solids increase the conductivity of water, the TDS meter works by measuring the conductivity of water to determine the TDS.

How do water purifiers regulate TDS?

The natural unfiltered water contains several essential minerals like calcium and magnesium. Also, since the natural water catches a lot of impurities, it also contains a lot of harmful dissolved solids like lead, arsenic, fluorides, heavy metals etc.

Water filters use reverse osmosis to filter out the dissolved solids responsible for elevated TDS levels in water. Reverse Osmosis removes all the dissolved solids including the harmful substances like salt, lead, arsenic etc. It also removes the healthy minerals like calcium and magnesium. The RO filter membrane removes 90-95% of the dissolved substances in water. Since the RO purified water doesn’t contain the essential natural minerals like calcium and magnesium, there is a need to add those minerals.

Water filters broadly use two kinds of technology to regulate the TDS and maintain some amount of magnesium and calcium.

TDS Controller

With TDS controllers, the water to be purified is divided into two parts. The first part goes through the RO membrane where all the dissolved solids (including essential minerals) are removed. The second part goes through a UV or UF chamber where the essential minerals are largely retained. Later, the RO filtered water is mixed with a small percentage of UV/ UF purified water and hence regulating the TDS of water. The percentage of water going into the UV/ UF chamber can be controlled using the TDS controller valve, thus allowing you to control the TDS based on taste.

Mineralizer

The water purifiers which use mineralizer to regulate TDS, pass 100% of the input water through the RO membrane. The output from the RO membrane is then passed through a mineral cartridge which restores the essential minerals like calcium and magnesium in the right concentration.

This way the water filters make sure that the TDS of water is regulated and kept between 50-300. This also makes sure that the water has essential minerals and has a good taste.

Key differences between TDS controller and Mineralizer
TDS controller Mineralizer
Some percentage of water is passed through the RO membrane100% of the input water is passed through the RO membrane
Not suitable for water with high concentration of heavy metals like lead, arsenic, fluorides etcSince, 100% of water passes through the RO membrane, it is capable of removing most of the impurities including lead, arsenic etc.
Provides control over the TDS of filtered water Generally, there is no control on the TDS of water
Small and cheap deviceMineral cartridge which requires annual maintenance

Water purification technologies

Sediment Filter

Usage of sediment filter along with a water purifier is optional and helps increase the life of water filter RO membrane. It is generally fitted outside the water filter and attached to the water input source. This filter essentially works like a net that catches large suspended impurities and turbidity in water.

You don’t need to install an external sediment filter if the input water doesn’t contain any visible suspended impurities or turbidity. Places where the input water comes without pre-treatment by the municipality should use an external sediment filter.

Generally, sediment filter can be used with all the water purifier types.

Carbon Filter

Carbon filter removes chlorine, volatile organic compounds (VOC), bad odor and unpleasant taste from the water. These filters work using activated carbon. Therefore, as water passes through the carbon, impurities like VOCs and heavy metals become chemically bonded to carbon.

Carbon filter can only remove impurities which can bond to carbon. Hence, we need to use further stages pf filtration to remove other impurities.

RO (Reverse Osmosis) Filter

RO water purification is the most important stage of filtration in the entire purification process. The water coming out of the carbon filter passes through the RO filter membrane.

RO water purification is the most advanced and highly efficient technology for removing dissolved substances from the water. If the water contains a lot of dissolved impurities including lead, arsenic, heavy metals etc, then RO filtration is the most appropriate technology to treat such water.

Reverse Osmosis filtration process works by forcing water through a fine membrane by applying pressure. As a result, the impurities inside the water are left behind as the water passes through the membrane. These membranes work by removing impurities based on their size. This means, that the filter doesn’t allow particles which have size larger than the water molecule. RO membranes work well in filtering most of the impurities including harmful chemicals, heavy metals, ions, bacteria, pesticides etc. Thus, it helps in reducing the TDS of water by 90-95%.

Reverse Osmosis water purification process

The water is separated into two parts. The impure water goes down the drain, and the pure water passes onto the next stage of purification.

Advantages
  • Removes dissolved salts, pesticides, and heavy metal impurities including arsenic, lead, mercury etc’
  • Only solution to purify hard water
  • Removes microbial contaminants including bacteria, virus, protozoa and cysts
  • Most advances purification technology
Disadvantages
  • RO filtration also removes essential dissolved minerals
  • Requires electricity to run
  • RO water purifiers are costly compared to other water purifiers

UV (Ultraviolet) filtration

Ultraviolet water purification technology is highly effective in treating water containing residual germs like bacteria and viruses. Like, RO water purification, UV also uses electricity to function. However, this process is completely chemical free.

This purification technology depends on the usage of ultraviolet radiations to kill the dissolved bacteria and viruses. The UV filters come with a UV bulb fitted, which produces strong UV radiations. As the water passes through the membrane, ultraviolet rays penetrate through the harmful pathogens and destroy these illness causing micro-organisms.

UV purification is capable of destroying 99.99% of harmful waterborne disease causing microbes without adding any chemicals. This also helps in preserving the taste and odor of the water.
UV water purification process
Source : www.caerfagu.co.uk

UV purification, in itself is generally not sufficient in treating the input water to make it suitable for drinking. Reason being, that it is only useful in killing the dissolved bacteria and viruses. UV purification can not remove dissolved impurities like heavy metals, pesticides, VOCs etc. UV purification is often used in conjunction with the RO water purification technology.

Advantages
  • Effective in killing 99.99% of dissolved bacteria and viruses
  • Doesn’t use any chemicals
  • Doesn’t alter the taste or odor of water
  • Requires low maintenance – only change of the UV bulb
Disadvantages
  • Can’t remove dissolved impurities like heavy metals, turbidity, pesticides etc
  • Killed germs are not removed from water
  • Requires electricity to function
  • Need to be used in combination with RO water filter

UltraFiltration (UF) purification

UF water purification technology works similar to the Reverse Osmosis (RO) technology. However, in case of ultra-filtration, the pores of the membrane are much bigger as compared to the RO membrane. Also, ultra-filtration doesn’t require electricity for functioning.

Ultra-filtration uses a fibre membrane which has a pore size of 0.02 microns. As water passes through this membrane, it blocks harmful bacteria, viruses and other contaminants. Suspended particles which are to big to pass through are also filtered out. As a result, the output water is pure and contains the essential minerals.

Ultra filtration water purification technology
Source: crystalquest.com

Since, the pores of membrane used in ultra-filtration are larger than those used in RO filtration, it doesn’t block harmful impurities like pesticides, chemicals, heavy metals etc. Therefore, it is generally used in combination with RO filtration.

Advantages
  • Ultra-filtration doesn’t require power to function
  • Germs are killed and removed from water
  • Capable of removing mud and turbidity from water
Disadvantages
  • Incapable of removing dissolved metal impurities like lead, arsenic etc
  • Generally, need to be used in combination with RO filter

Most of the modern day water purifiers use RO, UV, and UF in combination to achieve the best results. We have discussed further below, how you could choose between these purification technologies based on your input water source.

Functioning of RO+UV+UF water purifier
RO+UV+UV water purifier

Factors to consider while buying water purifier

Know your water input type – Choose between RO/ UV/ UF

Having discussed in detail all the water purifier technologies, by now you should have some clarity around how different purification technologies work. Following factors should be considered to choose the best water purifier suited to your home supply water:

  • TDS test to check the concentration of dissolved impurities in the input water. This is bare minimum test which must be done.
  • If there are industries nearby, chemical test should be done to find out if the source water contains heavy metal impurities. It is possible that the input water has TDS less than 300 PPM, but still contains significant concentration of lead, arsenic, mercury etc.
  • Check if the water looks turbid
  • Find out if the input water supply is known to contain dissolved virus and bacteria. If you are not sure, it is good to consider a water purifier which comes with UV filter.

Here is an indicative table you can use to figure out an ideal water purifier based on these different factors:

TDS of waterContains TurbidityBacteria and VirusIdeal water purifier
Below 300 PPMcheckcross UF water purifier
Below 300 PPMUV+UF water purifier
Below 300 PPMcrosscheckUV water purifier
Over 300 PPMcrosscrossRO+TDS controller/ Mineralizer
Over 300 PPMcrosscheckRO+UV water purifier+TDS controller/ Mineralizer
Over 300 PPMcheckcheckRO+UV+UF with TDS controller/ Mineralizer

If you are still confused, it is always safe to go for RO+UV+UF water purifier.

TDS controller vs Mineralizer

As we have discussed in detail earlier, water purifiers regulate TDS using either TDS controller or Mineralizer.

While TDS controller is a cheap device and doesn’t require high maintenance, it does have a disadvantage that the purified water is not 100% pure. This is because, with the TDS controller only part of water goes through the RO membrane. This is usually not a problem unless the input water has high concentration of dissolved metal impurities like lead, nitrate, arsenic, mercury etc.

In case there are industries nearby and the input water has high concentration of metal impurities, it is generally safer to use a mineralizer instead of TDS regulator.

Storage capacity

Storage capacity of the water tank is a personal preference based on the size of the family and the power stability in your area. If you live in an area with frequent and long power cuts, then you might want to go with a purifier which has a large storage tank. This will make sure that you get continuous supply of pure water even when there is no power.

Budget

Budget is an important consideration while buying a water purifier. If you are on strict budget then do not blindly opt for RO+UV+UF+TDS. Going for all the filters might unnecessarily increase your budget, when your requirement might just be UV+UF.

You should do a TDS test on the input water, and then decide which purification technology is required. You might also want to go for a water purifier with TDS controller instead of Mineralizer if you have a lower budget in mind.

Frequently Asked Questions

How much is the annual maintenance cost (AMC) of RO water purifiers?
The annual maintenance cost of a water purifier depends on the brand and technologies used inside the purifier. For a RO water purifier it generally varies between Rs 3000 – Rs 6000 per annum. It includes cost of replacement of various filters including the RO membrane, UV filter, UF filter, carbon filter, and Sediment filter.
However, it is best to verify with the purifier AMC provider.
What are Total Dissolved Solids (TDS) in water?
TDS stands for Total Dissolved Solids in water. It refers to the concentration of dissolved impurities in water, which includes dissolved minerals, salts, metallic impurities like arsenic, lead, mercury etc.
Water purifiers work by regulating the TDS in water to an acceptable limit which is safe and healthy for consumption.
Should I get an external sediment filter installed?
Sediment filter is advised if your input water contains a lot of suspended impurities and turbidity. Sediment filter is installed outside the water purifier and helps in doing pre-filtration before input water enters the water purifier.
By doing pre-filtration, sediment filter helps in increasing the life of RO membrane of the water purifier.
How much water is wasted with RO water purifiers?
The biggest disadvantage of using RO water purifiers is that it wastes a lot of water. Generally, with RO water purifiers the water wastage is 3 times; meaning for having 1 litre of purified water, 3 litres of water is wasted.
However, most of the modern day water purifiers come with water recovery tank to collect the waste water. The waste water can later be used for washing, cleaning, gardening etc.
Is RO purified water safe and healthy for drinking?
RO water purifiers come with TDS regulator which helps in restoring the essential minerals lost during the RO filtration process.
Hence, the purified water is free of source impurities and also contains essential minerals required for the body. As a result, the RO purified water is completely safe and healthy for drinking.
However, make sure that you buy water purifier only from one of the reputed brands and also get it serviced in a timely manner.
What does multi stage purification by RO+UV/UF do?
Most of the modern day water purifiers come with multi stage purification technology. Water passes through multiple filters at different stages of purification. For ex: Sediment filter, activated carbon filter, RO filter, UV filter, UF filter etc.
Water purifiers with multi stage purification are highly capable in removing all the dissolved impurities in water and also replenishing the purified water with essential minerals. You can also go through our buying guide for more details on different stages of water purification.

Winding-up

This brings us to the end of reviews and buying guide for 8 best water purifiers in India (2020). We hope that our buying guide was useful in clearing off the majority of your doubts regarding the different water purification technologies and also helped you to know which one is apt for you.

If you still have any queries regarding which water purifier to buy, feel free to drop a comment in the section below and we will get back to you.

Previous

7 best microwave ovens in India for 2020 – Reviews & Buyer’s Guide

Review Lens – Unbiased and honest reviews!

Next

Leave a Comment