RO vs UV vs UF – Difference between Water Purifier Technologies

Drinking clean and pure water helps in keeping us safe and healthier. Not just that, there are many health benefits of drinking pure water. It is very important to select the right ro uv uf water purifier as there are a lot of harmful particles present in the water like artificial chemicals, pesticides, bacteria and lead. All these harmful particles are present in both good water and metropolitan water.

In this blog, we are going to compare the three major water purifier technologies, RO vs UV vs UF,  which are widely used in India. After you all are well aware of the differences between ro, uf & uv water purification technologies, you can decide which is the best water purifier to buy for you and your family.

Reverse Osmosis (RO) Water Purifier

The Reverse Osmosis (RO) purification system passes water through the pump to increase the water pressure. Then the pressured water passes through the RO membrane. During the whole process, it requires electricity to operate and helps in removing the total dissolved solids and TDS present in the water. RO purifier converts hard water to soft water. The only drawback of RO purifier is that it wastes a lot of water which cannot be consumed for drinking.

The RO water purifier also helps in pre-filtration of the water if you want to purify the unhealthy water, and will remove all the germs and viruses present in it. But to boost the pressure of the tap water, it requires electricity. It also requires a lot of water input, for instance, if you input 3 litres of water, the resultant of pure water will be only 1 litre and the other 2 litres will be impure or dirty water which cannot be consumed. However, RO rejected water can be used for several household purposes including cleaning and mopping the house.

There are several RO water purifiers available, but a good RO system comes with a compact design, energy efficiency and easy operation. Let’s check some of the best RO purifiers available in the market:

Kent Grand Plus

Kent grand plus - RO+UV+UF+TDS Controlller water purifier
Kent Grand Plus – Best          RO+UV+UF+TDS Water Purifier

Based on the Kent patent technology, Grand Plus RO water purifier system removes dissolved impurities and retains all the essential natural minerals. It offers double purification of RO followed by UV, UF and TDS controller. It is suitable for raw water from all types of sources like storage tanks, bore well etc.


  • Double purification by RO + UF + UV with TDS controller
  • TDS Controller that maintains Natural Minerals
  • Inbuilt auto-flushing system
  • Auto-start and off enabled
  • Good Storage Capacity (8 litres)
  • UV and Filter change Alarms

Read more: Kent Grand Plus Reviews

Aquaguard Geneus

Aquaguard Geneus - RO water purifier
Aquaguard Geneus – RO Water Purifier

It is an intelligent water purifier from the house of Eureka Forbes that senses and chooses the purification technology depending on the quality of water. It uses all the purification technologies to provide clean and pure water to its users to lead a healthy life.


  • Electronic membrane prevents salt deposits and hence increases the life of the membrane
  • RO membrane maintains TDS levels and eliminates viruses
  • UF Filter removes micro-organism bacteria
  • Taste Enhancer uses carbon to clean and provides crystal clear looks

 Read Here: RO Purifier VS Other Purifier

Ultraviolet Rays (UV) Water Purifier

An Ultraviolet (UV) purification system kills contaminants, microorganisms with the help of UV radiations. The water passes through the UV radiation tube and thereby exposes water to the same. UV purifier is advisable to use with soft water which has fewer contaminants. The UV purifier requires electricity to purify, but it doesn’t need a power source to boost the water pressure as it can work with normal tap pressure.

The UV purifiers are compact designed and come with easy maintenance. It kills all the germs, viruses and bacteria present in the water but does not remove it as the dead bacteria will remain in the water only. It is a reliable, chemical-free and cost-effective water purification method. It does not change the taste and colour of the water after its purification. Check below some UV water purifiers.

If you are planning to buy UV water purifier, you shouldn’t miss these best UV water purifiers:

Kent Maxx 7-Litre UV Water Purifier

kent Maxx - UV UF water purifier
Kent Maxx – UV UF Water Purifier

Kent Maxx works based on UV and UF water purification technologies and comes with a storage capacity of 7 litres. It deactivates waterborne diseases causing bacteria but does not remove dead bacteria from purified water. Here is when UF technology comes in hand as it removes those dead bacteria from purified water.


  • UV + UF double purification of water
  • Auto shut on and off technology
  • Highly protected membrane
  • Built-in voltage stabilizer
  • Leakage free push-fit technology
  • Certified for efficiency and quality from the USA based WQA laboratory.
  • High purification rate of 60L per hour

Also Read: which is best: RO vs UV water purifier

Eureka Forbes Aquasure Aquaflo DX UV Water Purifier

EF Aquasure Aquaflo - UV water purifier
EF Aquasure Aquaflo – UV Water Purifier

Aquasure Aqua Flo DX UV purifier provides 3 stage purification by filters, UV, activated carbon and sediment filter. An error alarm system alerts you if there is any error in water purification. It can purify 2 litres of water in a minute. There is no storage capacity. Energy Saver Mode makes your water purifier Eco-friendly.


  • Powerful UV technology
  • Smart Dual Cartridges
  • High purification rate of 120L per hour
  • Built-in voltage stabilizer

Ultra Filtration (UF) Water Purifier 

Ultra Filtration, also termed as UF, is another purifier which contains hollow fibres threaded membrane. It helps in removing suspended solids, bacteria, viruses and other microorganisms from the water.  The UF water purification system works without electricity since it doesn’t need the tap water pressure. It functions well with the regular pipe water pressure.

The UF based gravity water purifier kills and removes all the germs and dead bacteria from the water. The only drawback that the non electric gravity water purifier holds is that it does not remove the dissolved solids in the water. So, you need to be sure about the levels of the dissolved impurities in the water. For that, you need to check the TDS or Total Dissolved Solids level in your water. A UF water purifier can work up to 10 years. A UF water purifier can work with tap water that one get via the Municipal water supplies.

If you are planning to buy UF technology water purifier, you shouldn’t miss these best UF water purifiers:

Kent Smart 

Kent Smart - Best UF water purifier
Kent Smart – Best UF water purifier

Kent Smart is a non-electric UF water purifier which helps in removing bacteria and viruses from water thus making it clean. It has a fully automatic operation with auto on and off function. It comes with a 7 litre detachable storage tank which makes it easy for you to clean on a regular basis.


  • Non-Electric and Chemical Free Purification
  • 7 litres Detachable Storage Tank
  • Fully Automatic Operation with Auto-Start and Auto-Off
  • Push-Fit Components for Leak-Proof Performance

Kent Gold Optima

Kent Gold Optima - UF Water Purifier
Kent Gold Optima – Gravity Water Purifier

Kent Gold Optima comes with a 10 litre storage capacity which purifies water as healthy as boiling water. It is certified by Water Quality Association and removes all dust particles and tiny particles. It comes with an ultra-filtration process which purifies water.


  • Non-electric and chemical free purification
  • Water storage capacity of 10 litres
  • NSF and WQA gold seal certified
  • Spin-welded UF membrane housing that prevents tampering

Both non-electric water purifiers are from Kent as only they offer water purifiers based on only UF technology.


If your water contains a large amount of dissolved salts, it is recommended that you buy an RO purifier. Now you are well aware of the differences between ro uf & uv water purification technologies. Now don’t hesitate and buy one ro uv uf water purifier as per your requirement and live a healthy life.

5 thoughts on “RO vs UV vs UF – Difference between Water Purifier Technologies

  1. Water Purifiers from Kent & Aquaguard are by-passing the water through a UF filter and mixing it with the RO water to maintain the TDS levels.Will this not affect the water quality as UF is not as effective as RO in filtering out heavy metals dissolved in the water?.On the contrary purifiers from LG & HUL are claiming that they pass 100% of the water through the RO thus offering the best purification possible.Can you give some technical details regarding the same.

    1. Hi Sailendranath,

      We would like to inform you that very less amount of water is bypassed through UF water purifier to maintain the TDS level. The process is necessary as the RO water purification process removes essential minerals from water. During the final stage of purification, water is passed through the UV filter, which ensures that there are no microorganisms present in water. Mineral RO technology of KENT has, however, received World Class Certification which ensures that it is completely safe for use.

  2. You mentioned that UF purifier water tank is detachable and easy to clean. whats the need of cleaning if purified water is already clean? I expect that it should have zero residue. if it needs cleaning then it means that water is not clean and have some residue.

  3. Hi Raju,
    The UF purified water is free of contaminants.However, water contains some essential nutrients, the residue of which may accumulate over the period of time. In addition, there are many homemakers who prefer cleaning the water tanks before storing. The water purifiers with a detachable tank are ideal for such homeowners.

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