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Water Purifier Buyer Guide |

Water Purifier Buyer Guide

Finding an ideal water purifier for your family can be a brain-straining task. With ShopClues Buying Guide, you will be familiarised with features according to end-use. Thus, assisting you to zero upon the suitable purifier for clean and healthy water.

Consider following points while buying a water purifier:

  • Capacity: How many members are going to use it?
  • Type: Will an Electric Water Purifier suit your family?
  • Features: What all features you must consider?
Water Purifier

Different Methods of Water Purification

One should always take into consideration important aspects like type of water (hard or soft), level of impurity, odour level, and flow of water. Water purifiers according to type are as follows:

Electric Water Purifier


  • Electric water purifiers provide continuous filtered drinking water as and when needed
  • They typically use UV or RO filtration
  • They need a power source
  • They don't usually store water
  • Stainless steel tanks are recommended as plastic can sometimes encourage bacteria growth
  • Typically wall-mounted
Select Electric Water Purifier
Non-electric Water Purifier


  • Ideal for houses that experience frequent power cuts
  • Can store water
  • Can be used in houses that don't have continuous tap water supply
  • Tank is usually plastic although stainless steel models are also widely available
  • Typically installed on table-tops
Select Non-electric Water Purifier
Single/Dual Stage or RO Purifier

Single/Dual Stage or RO

  • Carbon filtration process
  • Odour-free and clean water
  • Two types of water purifiers- Single/Dual Stage and Reverse Osmosis (RO)
  • No need of replacing a water tap
  • No need of changing in-built filters
  • Softens hard water
  • Removes lead, mercury, chlorine, and more
  • Eliminates cryptosporidium found in public supply water
  • Long life span
Select Single/Dual Stage or RO Purifier
Single/Dual Stage or RO
On-tap Purifier

On-tap Purifier

  • Active carbon technology
  • On-tap or faucet-mounted water purifiers
  • Can either completely replace the water tap or can be installed on the outlet/threaded portion of the tap
  • Filter replacement is required every 3-4 months
  • Option to choose between filtered and unfiltered water
  • Flow of water through tap decreases during filtration >
  • Fitted with solid-block and pre-coat absorption filters
  • Filter out lead, herbicides, chlorine, radon, and sediments.
  • Indicator for reflecting filter replacement
  • Chlorine removed efficiently
  • Reduces total organic carbon (TOC)
  • Moderate life span
Select On-Tap Purifier
On-Tap Purifier

Power Usage

One of the important aspects that you cannot miss out upon is the power option. Water purifiers powered through electricity have higher filtration capacities. Based on power consumption, there are following types of water purifiers:

Electrical Water Purifier

Electrical Water Purifier

  • Purifiers with reverse osmoses, UV, or UF technology use electricity
  • Have more number of filters
  • Water is either pushed or held back for different levels of filtration
  • Have inbuilt pumps to pull water from the direct supply in case of low water flow
Select Electrical
On-tap Purifier


  • Simple candle based or on-tap purifier
  • Saves big on electricity bill
  • Require taps with moderate water flow or manual filling of dedicated water compartments
  • On-tap or faucet-mounted and candle water purifiers fall under this type
Select Non-electrical

Different Methods of Water Purification

Some of the purification methods used are as follows:



  • Water passes through oblong blocks of charcoal granules
  • Granules absorb herbicides, pesticides, chlorine, and remove bad odour
  • Adopted for designing on-tap and cartridge water purifiers
  • Easily fit any kitchen without taking up a lot of space
  • Not dependent on Electricity
  • Recommended for areas with erratic power supply

Select Candle/Cartridge
Reverse Osmosis (RO)

Reverse Osmosis (RO)

  • Filtration takes place at the molecular level
  • Water is passed through carbon filters and a semi-permeable membrane
  • Membranes filter out dissolved salts and minerals
  • Weeds out micro-organisms and inorganic compounds
  • Recommended for areas with higher TDS count

Select RO
UV Purification

Ultra-violet (UV)

  • Water is passed through ultra-violet light
  • Water is up to 99% free of pesticides and all types of pathogens
  • Ineffective in removing suspended particles, chemicals and colour
  • Provides water with <5 ppb TOC

Select Ultra-violet (UV)
Ultra-violet (UV)

Ultra-filtration (UF)

  • Water is passed through fibre membranes
  • Fibre membrane holds back suspended solids and other impurities
  • Ideal for public supply water with low quantity of dissolved salt

Select Ultra-filtration(UF)
RO   UV   UF


  • Advanced water purification
  • Combination of reverse osmoses (RO), ultra-filtration(UF) and ultra-violet(UV) purification methods
  • First Stage- Water is passed through carbon filters and a semi-permeable membrane
  • Second Stage- Water is passed through ultra-violet light
  • Third Stage- Water is passed through fibre membranes
  • Result in 99% elimination of all the organic and inorganic elements
  • Ideal for all types of water supplies
Select RO UV UF
RO  TDS Controller  UV   Mineral Enhancer

RO TDS Controller UV Mineral Enhancer

  • First Stage (RO)- Water is passed through carbon filters and a semi-permeable membrane
  • Second Stage (UV)- Water is passed through ultra-violet light
  • Third Stage (TDS)- Ensures that the TDS level is below minimum
  • Fourth Stage (Mineral Enhancer) - Adds or enhances mineral content in the water
  • Ideal for areas with hard water and high level of TDS count
Select RO TDS Controller UV Mineral Enhancer
RO TDS Controller UV Mineral Enhancer
RO Plus

RO Plus

  • With triple and more level of purification, the end result ought to be above expectation.
  • The tap water passes through carbon filters, reverse osmosis membrane, ultra violet rays, and ultrafiltration filters.
Select RO Plus
RO Plus

Storage Capacity

Features Instant 7 Litres & Below 7.1 - 10 Litres 10.1 - 14 Litres 14.1 Litres & Above
Water Dispensing Instant Constant Constant Constant Constant
Storage No Yes Yes Yes Yes
Suitable for Bachelors or couples Couples, bachelors living together, and small offices Medium-size family Medium-size families, offices, and restaurants Large offices and joint families
Continuous Water Supply Requirement Yes No No No No
Power Connection No Available in Electrical and Non-electrical Models Available in Electrical and Non-electrical Models Available in Electrical and Non-electrical Models Available in Electrical and Non-electrical Models

Special Features

Market is full of water purifiers loaded with various features. You need to chalk out a list of features suitable for your home. Some of the features to consider are as follows:

Storage Tank

Storage Tank

  • Dedicated storage tanks for collecting filtered water
  • Offered in a capacity ranging between 5 to 10 litres
  • These purifiers have taps for easy access to the stored water
Auto Shut-off

Auto Shut-off

  • Ensures water doesn't spill out from the storage tanks
  • The auto cut off valve water supply as soon as the storage tank has reached its limit

Filter Change Indicator

Filter Change Indicator

  • Makes sure that the filters are changed on time
  • Alerts the user in the time of filter replacement and UV system failure
  • Ensures that the Purifier resumes function only after the filter has been replaced
Auto-Flushing System

Auto-Flushing System

  • Enhances the life of a filter membrane
  • Flushes the impurities out of system

Hot & Cold Water

Hot & Cold Water

  • Available in high-end purifiers
  • Option of switching between hot or cold water

Purity Indicators

Purity indicators

Purifier indicates the level of purity in input and output water

Important Tips to Remember

  • If you're using an electric purifier, run the tap for half a minute before turning on the purifier to let out contaminants that may be present with the first stream of water.
  • Depending on water quality, you may need to change the filter once a year or more. Professional replacement is always advisable.
  • Clean the purifier and the filter (if possible) every two months.
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