Drinking Safe and Pure Water Makes you healthier and it also suppresses appetite. There are many health benefits of Drinking the pure water. It is most important to choose the Right Water Purifier since there are a lot of harmful particles like bacteria, lead, artificial chemicals, pesticides that are present in Both Well water as well as Metropolitan Water Supplies.

In this post, I  am going to compare the Differences between the three major water purification system that are widely used in India.

After you know the difference between the Ro, UV, and UF Water Purification system, you can select the Best Water Purifier that is suitable for you.

Before you select any water purifier, you have to know the basic terminologies like TDS. In the previous post, I had covered about the TDS (Total Dissolved Solids).

Reverse Osmosis Purifier (RO), Ultraviolet Rays Purifier (UV), Ultra Filtration (UF) are the three most important methods of purification technologies that are widely used in India and all of them have Pros and Cons as well.

Difference Between RO – UV – UF Water Purifiers

RO Water PurifierUV Water PurifierUF Water Purifier
Requires Electricity to operateReuires Electicity to operateNo Electricity required
Kills and Removes all the Bacteria and Viruses from the Water.Kills all Bacteria and Viruses but their Dead Bodies remain in the Water.Kills and Removes all the Bacteria and Viruses from the Water.
Requires Electricity to Boost the Tap Water PressureUV Water Purifiers can work with Normal Tap Water Pressure.UF Water Purifiers can work with Normal Tap Water Pressure.
Removes the Dissolved SaltsCannot remove Dissolved SaltsCannot remove Dissolved Salts
RO Purifiers has Prefiltration system to work with the Dirty Water.Water should be clear for UV to work.Works with Dirty Turbid Water.

RO Water Purifier (Reverse Osmosis)

The Reverse Osmosis Water Purification System or RO Water Filter Requires electricity to operate, and it can remove the Total Dissolved Solids that are present in the Water.

The RO Water Purifier also offers prefiltration in case you want to purify the Dirty Water, and the purifier removes all the virus and Germs, but it requires electricity to boost the pressure of the Tap Water.

Reverse Osmosis Requires a lot of Water, If you input 3 Liters of Water into an RO Purifier, you will Get 1 Litre of Pure Water and 2 Liters of Dirty Water.

You can make use of the Dirty Water for mopping the floor and cleaning the house.

The Domestic RO Purifiers that are available online are not capable of desalination which means they can’t convert the saline water to fresh water.

Thre are a lot of RO Water Purifiers Available online, But a Good RO filter comes with Energy Efficiency, and it will be compact and easy to operate.

UV Water Purifier (Ultraviolet Rays)

The UV Water Purifier also requires electricity to work, but it doesn’t need additional power to Boost the Tap Water Pressure. The UV Water Purifier can work with Normal Tap pressure.

The UV Water Purification system can kill all the Germs, bacteria and the Viruses present in the water but the dead bacteria will remain in the water.

The UV has proven to be a reliable and cost effective methods of water purification. The UV technology is chemical free, and it does not change the taste and the color of the water.

On the top of all these features, the UV systems are compact and can be easily maintained.

UF Water Purifier (Ultra Filtration)

The Ultra Filtration, which is termed as UF, is another water purification system that works without electricity and completely kills and removes all the Bacteria, Viruses and other microorganisms from the water.

Unlike the UV Water Purifier, the UF purifier removes all the germs and dead bacteria from the water after killing them.

The UF Water purifier doesn’t require electricity since it doesn’t require Tap water pressure and works well with the regular pipe water pressure.

The only lag about the UF water purifier is that it will not remove the Dissolved solids in the water. So, you can use the UF purifier only when you are sure about the Level of the Dissolved solids in the water.

If you don’t know about the TDS levels in the water, it is good to opt for a Reverse Osmosis Water Purifier.

The UF Water purifiers can work up to Ten Years and work well with Municipal Supplied Pipe and Tap Water. The Tap Water that you get via pipes from Municipal water supply doesn’t have problems with TDS, toxic chemicals and Arsenic and other metals.

You need an RO Water purification system when the Water contain a lot of Dissolved salts.

Now you know the Difference Between RO – UV – UF Water Purifiers. If you have any queries regarding the water purification systems, post them in the comments section below, and I’ll be Glad to answer them 🙂


  1. I am really confused, please reply, i heard that local uv+ro+ uf water filters are not reliable, i have stomach issues so I heard that Kent RO is good by word of mouth but i read an article and it showed that only 3 water filters remove e coli bacteria responisble for stomach issues, namely, pureit advance, aquasure and unitex waterpot.

    After due research i found tha taquasure and untiex are nt worth it due to service issues but pureit advance got +reviews all round but the only issue is that Hindustan lever Pureit advance has only ro+uv combination, they dont have uf also with ro and uv , and kent doesn’t claim anywhere that they filter e coli bacteria. what should i buy ? i like pureit advance the best but it doesn’t have uf and kent doesn’t claim filtering e coli otherwise it has good reviews too,

    • All the Major water purification brands including Kent, Pureit, and Aquaguard employ a similar process to purify the water. E-Coil bacteria in water is due to sewage or animal waste contamination. E. coli 0157:H7 can cause intestinal infection. Boiling of water (Rolling Boil 100 C) will kill the E-Coil Bacteria. Always store the water in a clean sanitized pot.

  2. Sir I get water from my submersible motor which has boring till 360 feet deep, water is almost good but it has a unpleasant odor which lasts till 3 to 4 hours. In this case, please suggest me to choose between RO and UF. I don’t prefer RO because it removes all the minerals dissolved.

  3. it means if the water purifier is having only RO technology then the purifier is well enough for purify the water for drinking

    • RO is enough to remove all the impurities in the water. But, now most of the water purification brands are using activated carbon filter, sediment filter to remove suspended impurities. By doing this, the life of the RO membrane will be upped. Some of the RO water purifiers come with UV/UF combination to ensure 99% purity.

  4. Dear Srinivas, have gone through the last posts and thought this was really informative.
    You’d recommended Kent ACE Mineral, Kent Grand Plus, Pureit Mineral Classic, Aquaguard Enhance, Aquaguard Ultima for RO with TDS. How do I get an understanding of maintenance cost for each of these models – I understand this can be anywhere in the range of 3-10K every year. Pls let me know if any of these is better than others from a service experience and maintenance cost perspective. I reside in New Delhi.

    • Maintenance cost will be around ₹2,000 only. If the installation is not done properly, there will be leakage and other problems and the maintenance cost will be high. So, Make sure you get the service and installation done only by the Authorized brand representative.The service provided by these brands differ from one place to other. Aquaguard also provides Annual Maintenance Package that costs around ₹4000.

  5. Hi. Srinivasa Chaitanya

    Today I installed Kent UV water purifier. I’m from Chennai.

    I thought it was RO + UV. Now only I came to know that it is only UV. Really upsets. I need RO.

    Can you please suggest me, is there any alternative solution? Means any external kit for RO.

    Thanks in advance!!

    • Unfortunately, There is no external RO kit that you can connect to UV Purifier. IF you had bought the product online, you can return it within 10 days (Unused/new Condition only).

  6. I want to buy a water purifier. The water supply includes the ground water and municipal water. The requirement will include improvement in taste so i assume RO is included. As we are a family of two people, too much storage is not required. But i am concerned about two things:
    – Want to reduce the amount of water that goes to waste.
    – Avoid frequent service and want to know the amount of money that i will need to spend annually on service/filters etc.


    • The RO water purifiers come with a Drain Tube for collecting the reject water. Normally, the Darin tube goes into your Kitchen Sink. You can collect that reject water into a bucket and use it for Cleaning utensils. You can ask the service personnel for a longer drain tube and use the reject water for the Gardening purpose. Since you are a family of two members, the amount of water usage will be low and the maintenance cost will also be less. Just make sure you get the installation of the water purifier done only by the Brand Authorized service personnel. Check out the below models

      Livpure 7 L RO + UV +UF (Flipkart Link – http://fkrt.it/sc8BSTuuuN)
      Pureit Classic RO+MF (Amazon Link – http://amzn.to/2sqvHt1)
      Pureit 6 Litres Mineral Classic (Amazon Link – http://amzn.to/2rtTxiH)
      Livpure Glo 7-Litre RO + UV + Mineralizer (Amazon Link – http://amzn.to/2sm8xTJ)

  7. Kinsco Aqua Style, AQUAGRAND AQUA, and BLAIR 15 LTR RO. I have a low budget …can you please tell me which will be best.. my budget is under 6 thousand.

    • I will not suggest anyone buy the water purifiers you have mentioned. The Conventional Low Budget RO water purifier you have mentioned will wash away all the Minerals in the water and there will be no control over TDS levels. If you are on a Budget, check out Pureit Classic RO+MF (Amazon link – http://amzn.to/2rmun5B)

  8. Hi sir
    I am living in north east up and I have under ground water supply form municipality so plz tell me which water purifier is best for me.

    • Ground water might have High TDS levels. So, It is better to go with RO + UV water purifier. Pureit Mineral Classic, Kent Grand Plus, Kent ACE Mineral, Pureit Ultima, Aquaguard Geneus are some of the Top models. Also, have a look at Livepure RO water purifiers. They are also providing good support.

  9. Hello!
    I have read the above comments and feedbacks and yet I desire to ask you….
    We are from the defence and after much thought we picked up Aquaguard Compact model as wherever we get posted we get govt. supply.
    Got posted to Delhi where we are currently getting hardwater TDS is as high as 400 and have been using aquaguard for cooking whereas for drinking we are relying on bottled water.
    BOttled water is expensive and I need your suggestion as to what can I do?
    One should I switch to RO?is there any RO model where I can control the salt levels. But have recieved negative views as RO kills essential salts as well.
    Or should I cont. like this and await for our next posting!
    THank You

    • RO water purifiers that are equipped with a TDS controller or Mineralizer can retain the natural minerals in the water. So, Only the toxic – Hard metals will be removed and essential minerals are retained. Check out Kent ACE Mineral, Kent Grand Plus, Pureit Mineral Classic, Aquaguard Enhance, Aquaguard Ultima. These RO water purifiers can work with water having TDS levels up to 1500 ppm. Make sure you opt only for a Branded RO that comes with a TDS controller.

  10. I am planning for unbranded water purifier. What are pros and cos over branded water purifier except after sales service?
    I talked to two local suppliers, both offers low TDS result but their pricing is quite different. What are the factors should I look into before selecting one?

    • Most of the Unbranded RO water purifier do not have a TDS controller and all the minerals in the water will get washed out. Water Purifier is a one-time investment. Why opt for an Unbranded product when the branded RO water purifiers are available at an affordable price!

  11. I am living in Navi Mumbai. Using a UV water purifier for long time for municipal supplied water. For last couple of months I am having stomach problem. Doctor suggesting to use boil water.
    Could you please suggest me a good water purifier which can solve the purpose.
    I am confused between RO, UV, YES, MTDC, UF terminology.

    • The TDS levels in your water might be on the higher side. SO, you can opt for an RO+UV water purifier. I have mentioned the Top RO UV water purifiers in this site. Please browse to find the right product that suits your needs. Kent, Aquaguard, Pureit, Livepure are some of the Top brands.

  12. I’m about to shift to ranchi and so i dont know the lvl of TDS of water in ranchi!
    I also want some suggestions on which purifier i should buy! Aquaguard genus/enhance/ pureit ultima. Aquaguard comes with TDS regulator.
    Pls suggest me!

      • Yes, TDS regulator/Mineralizer is a must have when you are buying an RO water purifier. The job of RO membrane is to remove all the Hard, Toxic Metals like Lead, Arsenic, Cadmium and other Salts from the water. The TDS controller makes sure that natural minerals are retained. So, the water will be pure and also tasty with the required amount of minerals.

    • All the models you have mentioned comes with a TDS regulator and can work with any kind of water source with TDS levels up to 1500 ppm. You have to opt for the brand that provides quick support at your place. Kent, Pureit, Aquaguard, Tata Swach are some of the reputed water purifier brands in India. The service provided by these brands might differ from place to place.

  13. i was told by one of my friend who is working in the water purifier field that if RO purifier is not required & if i will be using the same there is a chance of getting stomach problem. is it correct or not. can you please guide me in this regard.
    the problem is my job is transferable with short notice, as of now i am staying in mumbai and using BMC water. As per the person who came for demo only uv is required. because of my job profile i thought of buying the RO purifier. pls guide me to take a good decision.

    • What your friend said is not right. You don’t get stomach or any other problems when you use an RO water purifier at your home. Branded RO water purifiers that come with TDS controller/Mineralizer also retains natural minerals in the water. If there is no TDS controller, all the minerals in the water will be lost. So, It is better to opt for an RO that comes with a TDS controller. Check out https://www.bestwaterpurifiers.in/best-ro-uv-water-purifiers/ this post to find full details about RO water purifiers.

  14. If RO removes dissolved salts , and kill viruses and germs then with 300 above Tds we should use RO purifier
    Why there is a need for combination of RO +UV
    If RO works in both way so why we prefer combination could u please suggest there are lot of confusion

    • UV is just there for further protection or backup. The UV bulb doesn’t cost much and works for a long time. So, the water purifier brands install it to ensure the water is 99% free from contaminants.

    • UV water purifier is suitable for Low TDS water. If your water is salty or the TDS is high, you have to opt for RO water purifier.

  15. I get municipal water supply and TDS recorded is between 100 to 110…Pls suggest which water filter do i need to install at home. we have a family of 4….Would just UV or UV+UF satisfy or RO+ UV is needed for 110 TDS..pls suggest the best and economical purifier based on the annual maintenance cost…

    • RO is not required for Low TDS. You can opt for UV + UF water purifier. Have a look at Kent Maxx, Pureit Marvella UV water purifiers. In case your shift from one place to other or your water source changes, It is better to opt for RO water purifier.

  16. Hi chaitanya
    I Manish lived in rohtak. I want to buy water purifier but I m liitle bit confused , can you help me regarding this.
    Water is having dust particles which get settled down and past few days taste and odour are unbearable.
    So , that’s why I planned which technology nd which brand purifier are best.

    • As there are a lot of Dust particles in the water and the taste, the odour is bad, you need an RO + UV + UF Purifier. Have a look at Kent Grand Plus, Aquaguard Geneus.

  17. Sir, now we are using kent Maxx UV+UF . in order to upgrade, in the same unit can we able to add RO filter ?? please confirm.

  18. Hello,

    Where you have given column wise differentiation above between Ro, Uv and UF purifiers, you have mentioned that NO electricity required for UF purifeirs.

    But below you have stated that UF purifiers works with electricity .
    Need clarification for the same.


    • Thanks for mentioning. It is my mistake. UF water purifiers don’t require electricity and suitable for Low TDS water.

  19. I am from Bangalore, We get Cauvery water and TDS level before filtering is 110-115, I have Aquagurd Total NF Reviva model water filter. TDS level comes around 32-38 after filter with RO, Can you please let me know if it is safe to drink and what should be minimum TDS level.Is it safe to drink bypassing RO ,Please let me know.

    • Rain Water is the purest form of the water, and the TDS levels for Rain Water will be around 30. For TDS levels around 100, RO is not required. But, if the water purifier comes with a TDS Controller, No minerals will be lost. I am not sure if the Model you have mentioned comes with a TDS controller.

  20. Water in the well is recharging with irrigation canal water. The water in well is used for drinking. So I want to know the good water purifier.

    • Well water might have high TDS levels. But, as you mentioned It is refilling with Irrigation canal water, you have to make sure the TDS levels in that water. If the water is Hard, you have to opt for an RO water purifier.

  21. Hi,
    Kent/Aquaguard which retain essential minerals does not pass all the water through the RO. So there is a possibility that some dissolved salts like Arsenic and lead will not get removed (From water flow diagram of instruction booklet). Any thoughts?

    • First, the raw water passes through the sediment filter, activated carbon filter and the to the RO. Once the water passes through the RO, it is also passed to the Ultrafiltration and Ultra violet radiation. Kent’s Mineral RO is certified by water quality association, USA, and the Bureau of Indian standards.

  22. We live in North 24Parganas, West Bengal. and use personal pump water. I ask to know what is the defference between TDS remover and TDS Controller ? what is best for me ?

    • If you get Hard water, I suggest you buy an RO water purifier that comes with a TDS Controller. I have listed all the top models in this site. Please check them.

  23. What is the Difference Between TDS Remover and TDS Controller ? I could not understand which purifiers is best for home uses.

    • TDS remover removes all the salts present in the water which is not good. Some Minerals like Calcium and Magnesium are required in the water. On the other hand, Some of the top branded RO water purifiers come with a TDS controller or Mineral Guard that retains the natural minerals in the water and only hard metals will be removed.

  24. Comment:wich one is best RO+UF or RO+uv in kent brand please suggest me

    and some are there have ala ro+uv+mf is that really make sense?

    • RO is required to remove Hard metals, salts in the water. UV is for killing bacteria. UF membrane is required when there are a lot of suspended particles, dust in your water.

      Micro Filtration is also similar to Ultra Filtration except for the membrane size.

  25. I am trying to decide between Kent Maxx (UV + UF) and Kent Ultra (UV).

    I understand that Kent Ultra has a sediment filter and carbon filter in addition to the UV tube to take care of any dirt or impurities in water. In that case, is it still better to go for Kent Maxx at a higher cost or Kent Ultra would suffice.

    We live in Mumbai and get municipal water at home.

  26. I was told by a vendor that in an RO+UV purifier, the RO is used for 50-60% of the water being purified and the balance is purified through UV in parallel. This is done to ensure that TDS does go below 30 or so which can make the water taste extremely bitter. So basically what he said was that its not as if the water first gets filtered through RO and then through UV.
    Do you think that is correct?
    Have not really been able to find how a RO+UV works in terms of the purification steps.

    • RO and UV Purification technologies are entirely different.

      RO Uses very fine membranes to remove the dissolved particles from the water. Ro is capable of removing Hard metals like Arsenic and Lead from ground water.

      UV uses Ultraviolet light to kill bacteria and viruses. If the water contains more dust particles, the UV rays are blocked by dust and not kill bacteria.

      Conventional RO water purifiers that are available in the local market (unbranded) remove all the minerals from the water.

      But, the RO water purifiers that I have mentioned comes with TDS controllers.

      The TDS controllers/modulators can retain the natural minerals present in water. So, the water is not only mineral rich but also taste good.

  27. Now I’ve more questions than answers 😐 .
    RO+UF or RO+MF . I think UF is better than MF cause the pores are smaller.

    What do you think ?

    • Smaller the pores better will be the technology to remove dissolved particles. Kent RO + UV technology is an award winning technlogy. I have been using Kent Grand + in my home from the past year and have not faced any problems. The taste of the water is also good. But, i have to say that there is some water wastage. I am collecting all the drain water into a bucket and using it for cleaning purposes.

  28. Now that’s what I call a quick reply.

    Thanks Mr. Srinivasa Chaitanya. Ill go to your website and find a good one n then buy it

  29. RO+UV OR RO+UF ?
    Hah! which one would you prefer. I can’t decide 🙁 .

    Please tell me the advantages/disadvantages of both 🙂

    Thanks a lot man


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