RO vs UV vs UF vs TDS – How each water Purification method differs and which one is best for you

The present article will give you complete insight on difference between RO, UV and UF water purification methods with TDS description. From this, you are able to compare RO, UV and UF water purifiers side by side and decide on, which is best for your current needs.

In RO (Reverse Osmosis)water purifier ,the RO membrane actually eliminates all germs and viruses in the water by cleaning out all organisms. Apart from this filtering hole in the RO membrane is very tiny that it can also eliminate melted salts.

Check the below video to understand more on how actually reverse osmosis process works and how water is cleaned by using RO process.

In a UV (Ultra Violet)water purifier the microorganisms and different tiny living organisms are not physically detached but destroyed by the influential UV light of the UV water purifier.

The UV lamp just destroys the germs but the bodies of the dead microorganisms still remain in the water. For the UV purifier to function properly, the UV light needs to pass through the water to destroy the germs.

Go through the video below to understand more on UV process and how water purification happens through UV process.

UF (Ultra Filtration)is a kind of membrane water purifier. In an RO there is membrane and the filtering holes are very tiny that it can also filter out salty particles from the water. In its UF membrane the holes are greater and hence it cannot filter out salty particles.

But as compared to that the UF membrane filtering holes are yet slighter than the lowest of living organisms, the viruses. The benefit of the UF water purifier over other is that it operates without electricity and is assured to filter out any illness causing germs. The only difficulty with UF water purifier is that in situation any damaging dissolved salts are present in the water; it cannot completely filter it out.

Check the video below to understand more information about UF water purifier.

TDS is meant to indicate Totally Dissolved Solids in water and it is measured in Parts per Million (PPM).Practically, there is no smallest TDS limit definite for any form of water purifier. The lesser the TDS the better the water purifier is.Read here for more information on TDS and how you can measure TDS in water.

Ro vs UV vs UF vs TDS - Difference and how to choose between them in India

Studies have shown that the minimum TDS must be at least close to 30 ppm – that maintains the mineral levels in check in water purifiers. The Bureau of Indian Standards (known as BIS) sets the higher limit of TDS in water at 500 ppm. Critically the standard also references that in case no other source of drinking water is obtainable, then this greater limit can be meant to 2,000 ppm for RO, UV and UF based water purifiers.

Here is an interesting discussion happened in QUORA on TDS limit in drinking water and is worth reading if you are more interested in understanding TDS.

You can decide which type of water purifier to use based on TDS value in your drinking water as well.

  • RO purifiers are recommended provided the TDS surpasses 100ppm.
  • UV purifiers are recommended provided the TDS is less than 100ppm.
  • UF purifiers are recommended provided the TDS surpasses 500ppm.

Don’t be in a hurry to just go out and buy a water purifier with out understanding more about your drinking water.

If your water is more salty and you use only ground water then it’s better to go for RO based water purifier.

If you get your water via tankers from outside or corporation water supplied by govt then you should be even more careful because no one is sure of the exact quality of water.In this scenario RO + UV combination purifier works best.

If you feel that your water’s TDS levels are very high and not sure of quality as well then it’s best to go for combination of all three technologies. that is RO + UV + UF based water purifier.

First understand your source of water and what kind of purification you need before going ahead with selecting right water purifier for your home.


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