Drinking Safe and Pure Water Makes you healthier and it also suppresses appetite.

There are many health benefits of Drinking the pure water.

RO vs UV

It is very important to choose the  best 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.

Reverse Osmosis Purifier (RO), Ultraviolet Rays Purifier (UV), Ultrafiltration (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.

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 the TDS (Total Dissolved Solids).

Difference Between RO UV UF Water Purifiers

RO Water PurifierUV Water PurifierUF Water Purifier
Requires Electricity to operateRequires Electricity 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

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. Also, unbranded RO water purifiers do not retain natural minerals.

Thre are a lot of RO Water Purifiers Available online, But a Good RO filter is capable of not only removing the bad salts and hard metals but also retain the natural minerals in the water.

UV Water Purifier

The UV Water Purifier also requires electricity to work, but it doesn’t need additional power to Boost the Tap Water Pressure. It 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 reliable and cost-effective methods of water purification. 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

The Ultrafiltration, 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.

You need an RO Water purification system when the Water contains a lot of Dissolved Salts. Also, If you don’t know about the TDS levels in the water, it is good to opt for a Reverse Osmosis Water Purifier.

RO vs UV

Ultra Violet Purification: How it differs from RO?

The RO process takes care of the major aspects of purification. However, traces of contaminants like certain germs, bacteria, and microorganisms sneak through the RO filters.

These germs can cause dangerous diseases like typhoid, dysentery, and diarrhea. The UV purification system comes to the rescue by elimination such dangerous bacteria from the RO purified water.

The biggest disadvantage of the RO water purifying system is that it wastes a lot of water depending on the concentration of the impurities.

On an average, you have 1 part of pure water to every 2-3 parts of reject water. This can be a criminal waste considering the fact that there is an extreme shortage of water resources.

Ultraviolet filters do not waste any water. They do not use chemicals to purify water thereby ensuring they maintain the taste of water.

The UV filters do not require as much maintenance as the RO filters do. However, the UV filters are not capable of removing salts, nitrates, fluorides, and heavy metal impurities like arsenic and lead.

RO vs UV vs UF

Ultrafiltration – How is it different from RO and UV?

Ultrafiltration process does not require any electricity to operate. The UF membranes have slightly larger pores as compared to the RO membrane filters. They can take care of bacteria, viruses, and germs, but are ineffective in eliminating TDS.

The advantage of UF is that it does not require much maintenance and the filters have the capacity to last long. These filters are not efficient in handling heavy metals and water with high TDS levels.

UF differs from UV in the sense that it does not make use of ultraviolet radiation to remove impurities.

Final Words – Wrapping it up

Every type of water filter, RO or otherwise has some negative aspects. A combination of RO, UV, and UF along with TDS controllers is the best one for every Indian home. Ensure to have this combination in the water purifier you select.

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. Hi,
    TDS level is around 850 of bore water in my home. I am planning to buy UF purifier. Is it best option or i have to go for another option. We have no problem with water taste.

  2. my bore water tds is 850. yesterday I installed a aquaguad RO UV MTDS purifier. output water tds is below 100.
    taste is good. but this purifier doesn’t have UF. please tell me my purifier is safe and appropriate for me or not?

    • It is safe only. Just RO is enough to remove all the impurities, UV UF or MTDS are there to care of bacterium and other contaminants present in the water which is not passed trough the TDS Controller. Your Purifier is safe and the TDS levels are good. No need to worry.

  3. What is name of cations and anions, Biological Bacteria. How much ppm allowed cations/ anions in water and per swiss / BIS.. please..

    • The TDS levels in your water source is good. No need to install an RO water purifier, you can simply buy an UV water purifier that removes the bacteria and other contaminents.

  4. Hi!
    I am having Kent Pride Plus model which has RO UF TDS controller UV in tanks. But UV in tanks works only half an hour in two hours that means if the tank is refilled before two hours than UV will not work.
    Please guide whether the water is safe for drinking.

  5. I see a lot of Alkaline Purifiers in market. TDS level in my area are below 200 and sometimes in Summers have to get water through tankers. Please suggest which water purifier RO or Alkaline.

    • Alkaline and Reverse Osmosis are two different methods of water purification. There is no water purifier model that comes with both the RO and Alkaline Purification process. In fact, Alkaline water purifier models are not much available in India. Depending on the TDS levels in your water, you have to opt for an RO or normal UV/UF water purifier. Also, it is better to buy an RO that comes with a TDS Controller or Mineralizer.

  6. hi sir ,
    i have been looking out for a new water purifier for my home .
    the water which is supplied is from municipality.
    so i am thinking to buy uv uf water purifier .
    my budget is 13,000 rs
    i m bit confused about which brands should i choose
    kent, aquaguard or livpure.
    as uv uf technology doesn’t require much maintenance .
    planning to use it for the next 10 years .
    can u also suggest some good models
    hope to get an answer from you soon and thanks in advance.

    • What are the TDS levels in your water source? As you mentioned that you get water from the municipality, the TDS levels will be generally good, so UV UF water purifier will do the job. But, if you are planning to use the water purifier with borewell water, RO technology is required to purify the water.

      Checkout the below uv uf models

      Kent Maxx 7 L UV UF Water Purifier (Amazon Link – http://amzn.to/2ddbmS1)
      Aquaguard Superb 6.5-Litre UV UF (Amazon Link – http://amzn.to/2y3QWmW)

  7. We have Aquauard Enhance UV RO plant. Water supply is from tubewell , with TDS of around 600. We want to remove/ bypass RO unit / tube.
    Is it ok to have unit without RO unit ?

  8. I am in Chennai near the coast. TDS is close to 1800 and the water is slightly salty to taste. Will RO work for me.

  9. Hi Shiva,

    I am from Rajasthan. In RO based water purifiers a lot of water is wasted. Does the same holds true for UV/UF combined water purifiers as well. Thanks.

  10. Hi,

    Your blog is confusing.
    You mentioned
    -RO can reduce TDS and also kill and remove germs, bacteria, virus.
    -UV kill germs, bacteria, virus (using electricity) Donot remove these dead bodies plus cannot reduce TDS.
    -UF kill and remove germs,bacteria, virus. Donot reduce TDS.

    1) So if I have high TDS (more than 200) it’s mandatory to use RO. Then why you suggesting to use UV-UF even though RO is doing all??
    2) Why are all big brands combining RO, UV,UF together in one product when each of these are doing same task??
    3) What is TDS adjuster?? Information I have is companies mix small amount of untreated water in treated to increase TDS level in final water output?? Do you have some insight how it works??
    4) With high density membrane water purifiers RO based reduce TDS by90-95%. Then how can they adjust TDS??

  11. I have couple of questions after reading your Article and the posted questions, the basic premise being that the quality and contents of Water keeps on changing from day to day and we CANNOT control it:
    1. Why does UV/UF used with a Slash?
    2.Do we need only one of these or both?
    3.Does any System have both?
    4.If one has to choose between UV and UF, which one is better assuming normal Corporation Water which we all know how good or bad it is?

    • Most of the RO water purifiers are equipped either with UV or with UF chambers for additional purification. Now, most of the models come with the combination RO UV UF technologies to ensure that the water is 99% free from bacteria and virus. Have a look at the below models that with RO UV UF Combination.

      Kent Grand Plus (Amazon Link – http://amzn.to/2vNuihO)

      Livpure Pep Pro (Amazon link – http://amzn.to/2fqNER3)

  12. hi,
    can you provide the detailed digrame of parts used in aquaguard uv uf. so that i can myself service the same and if needed replace the parts.
    thanks in anticipation.

  13. Hi
    The TDS of our boring water is 560 mg/ltr.Which is the best purifier(Ro/UV/UF) to use without affecting the required/essential minerals?And what should be the TDS of a healthy water?

  14. Is whirpool Minerala 90 Platinum RO Water Purifier – 8.5 L (8.5 Ltr) filter good? We have Pune corporation water.

    What will be the maintenance of RO water purifier.

    Thanks in advance for your help!

    • The water purifier you have mentioned is good and is suitable for water having TDS levels up to 2000ppm. The maintenance cost will be around Rs.3000 – 4000 for most of the RO water purifier models. It is better to check the TDS level in your water source as you get corporation the TDS levels might be already good. If the TDS levels are low, you can simply opt for a UV UF water purifier.

  15. Hi, Your blog is so informative. I’m from Hyderabad and the water we use is of tds level around 320 to 350 and it’s not salty and clear municipal water. Please suggest me, Can I use Aquaguard Crystal Plus UV water purifier.

    Thank you,

    • Aquaguard Crystal Plus UV is the right choice for you as the TDS levels in your water are good. But, this Aquaguard model does not have a storage tank. In case of power cut, you won’t get water. You can also have a look at Kent Maxx UV that comes with a 7-litre storage tank.

  16. what is ur opinion about Pureit Advanced (RO MF) 5 L RO MF Water Purifier (White)
    and kindly helpo me to understand MF .


    • Most of the reverse osmosis water purifiers are equipped with either UV/UF or MF for backup purpose and to make sure that the water is 100% free from the contaminants.

      Also, these RO water purifier comes with a TDS controller and a little bit of water is directly sent through the UV or UF chamber to maintain the natural minerals in the water.

      MF means microfiltration which is similar to the ultrafiltration.

  17. Our drinking water has TDS of around 350 mg/L, but the hardness is little bit high, as evidenced from the settling in the boiled water and also from the scaling on buckets and taps in the bathroom. Which type of water purifier should be used?

  18. In a combo of RO and UV does it mean that we can select one of the two to use simultaneously or whether the purifier will itself use both together? Also, I have borewell water at home so which is the best one suited?

    • Both RO and UV will work together. First, the water passes through the RO which eliminates hard metals and most of the bacterium form the water. Then the water passes through the UV chamber for additional purification, just to ensure that the water is 100% free from contaminants. For borewell water, it is better to go with a RO UV water purifier like Kent Grand Plus, Kent ACE Mineral, Livpure Glo.

  19. Hi i am looking for water purifier and in my area water is hard and we also use boring water.. My son falls sick frequently.. What type of ro we shud go for.

    • Hi There, If your water source is Hard, you have to go for an RO water purifier that removes the hard metals and salts from the water. It is better to take your water sample to a lab and check the TDS levels and if there any presence of harmful salts in the water. If the TDS level is high and not much harmful metals in the water then you can go with an RO water purifier that comes with a TDS Controller (EX: Kent Grand Plus, Kent ACE Mineral, Livepure RO) If there is presence of a harmful substance in the water, then you can go with an RO water purifier that offers 100% RO water purification Mineralizer (100% water passes through RO Membrane and Minerals will be added at the end EX: LG RO water purifiers)

  20. Hi,

    The place where I am staying, the TDS level of the tap water is 330. And the water has high levels of arsenic and iron. I am currently using Pureit Marvella UV filter along with an iron guard. Is this filtered water safe for drinking. Or do I need to install an RO filter?

    Thank you.

    • If Arsenic is present in your water source, you have to use an RO Water Purifier that removes the hard metals. Marvella UV cannot remove the dissolved salts from the water, it only removes bacterium.

  21. Hi,

    What is the difference between RO and RO UV ?
    If I’ll get mix water , some time TDS high , some time low… How RO UV work in that case ?
    I read few articles and got to know that RO filter remove essential minerals also so not good for health…

  22. We get borewell water mixed with municipal water for drinking purpose. Should I go for water purifier or RO. Also, I have shortlisted Aquaguard Geneus and LG puricare model. Kindly suggest the brand ( can be other than this) and model I need to purchase.

  23. Hi Chaitanya,
    I am in chennai and my water TDS level (1000 ) and salt is very high (some time water will come like brown yellow colour) Kindly advise which is the best water purifier and Cost effective. Which are the specialities is required compulsory.

    • TDS 1000 is very high and the water is not suitable for consumption. In Such cases, you have to opt for an Reverse Osmosis water purifier. The RO water purifiers are capable of removing the dissolved salts, hard metals and other bacterium from the water. The Annual Maintenance cost will be around Rs.4000 for an RO water purifier. It also depends on the TDS levels in your water and water usage. Please checkout the below RO water purifier models.

      Kent Grand Plus (Amazon Link – http://amzn.to/2vNuihO)

      Kent ACE Mineral (Amazon Link – https://amzn.to/2LKalx7)

      Pureit Mineral Classic (Amazon Link – http://amzn.to/2qBeID6)

      Livpure Glo (Amazon Link – http://amzn.to/2qKKpa4)

      Bluestar Majesto (Amazon Link – http://amzn.to/2scSxVK)

      Aquaguard Geneus (Amazon Link – http://amzn.to/2wiybuY)

  24. Thanks, Chaitanya for the pretty informative post. Can you help me understand the advantage of larger pores in UF when compared to RO?I’m trying to see if my water purifier has RO does it require UF again?

    • RO is better than UF. Ultrafiltration water purifiers have larger pores than RO and they cannot remove the dissolved salts from the water. In Most of the RO water purifiers a part of the water will not pass through the RO membrane and directly goes through UV/UF. This is done to maintain the TDS levels in the water. So, it is better to opt for a water purifier that comes with RO UV/UF combination.

  25. Hi Chaitanya,

    Your blog is pretty informative. I would like to know which purifier will suit 130PPM TDS level in water. I am getting multi source water and TDS varies often. Highest i have observed is 130PPM.

    • The TDS levels in your water source is good i.e. 130 PPM. TDS Levels above 500 is not good. In that case, you need to opt for an RO water purifier. For TDS levels below 400ppm, UV UF water purifier is good. Checkout Kent Maxx 7 litre UV UF water purifier (Amazon Link – https://amzn.to/2qpDOma)

      • Thanks Chaitanya. I have bought Kent Pearl which is RO UV UF TDS Controller, since TDS level goes above 200 PPM at times.

  26. Hello sir,
    A couple of days back i got to hear about a company named as wave which manufactures water purifiers. It has this option of RO UV UF and is available under 10,000 rs.
    Any suggestions, should i go for it or stick to my previous ro purifier brand i.e. kent, which is priced at 16000 rs. ??

    • What about the Service Quality provided by that brand? Does that water purifier has a TDS Controller/Mineralizer? Can you gather more information about the Purification process of that water purifier. Also, Kent ACE Mineral is a good water purifier and is priced around Rs.13000.

    • There is no much difference. In General, RO is enough to remove all the dissolved salts and the bacterium from the water. UV/UF are employed for the backup purpose. Both the combinations you have mentioned are good. RO UV is the popular one.

  27. Sir blue mount company has a feature of alkaline instead of tds controller in what way is it beneficial,and I think my tap water tds level is below 300

    • I have Just seen Blue Mount website and there is no much information about the purification process. Actually, RO and Alkaline Purification are different water purification technologies. Alkaline (Electrolysis) water purifiers give water that is less acidic and rich in calcium, potassium and other Alkalizing compounds.

  28. Hello Chaitanya
    I am from Kolkata
    Considering to purchase a water purifier
    I have read that RO removes essential minerals from water such as magnesium and calcium due to which consuming RO purified water is harmful for your health in the long run.
    New purifiers have come up in the market which claim to add back necessary minerals. Can you please suggest which would be best considering all pros and cons (UV / UF / RO / etc) to the health?
    I need one which will provide only healthy water for my family and will not cause any side effects to the health in the long run.

    • RO water purifiers with TDS Controllers / Mineralizers retains natural minerals in the water and the required minerals will not be lost. If the TDS levels (Salt levels) in your water are high, you can install an RO water purifier otherwise no need for an RO water purifier. For Low TDS water, UV UF water purifiers will do the job. I have listed all the Top RO, UV UF water purifiers in this Post. Please have a look. Go for the brand that provides good support at your place.


  29. I get corporation water which has low TDS. I had ordered for a 6 Lt. UV UF water filter but by mistake the Seller(Amazon) has sent a RO UF water filter.
    I can return it but I am not sure whether I will be paid the full transportation charges as I may have to Insure it also. More than that I
    I want to know what will be the approximate AMC maintenance cost difference between RO UF and UV UF filters.

    • RO membrane is costlier than a UV bulb or UF membrane. So, the maintenance cost for RO water purifiers will be around Rs.3000 – Rs.4000 per year. For UV UF water purifiers, AMC will be around Rs.1000 – Rs.1500.

  30. Hi,
    In my home(Ghaziabad) we are getting water supply which has TDS around 190-200. I called the Kent agent and as per him TDS should
    be less then 100. should RO required or UV UF is good? Please suggest.

  31. Our is ground water with tds 270/- checked by one kent sales person.
    I am living in rented oremised and when i change house the tds could increase
    If i go for ro uv uf from LG is it ok or will the water be depleted of minerals.
    Or should i go for aquagard genius
    Pl suggest i am confused

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