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What is the difference between RO and UV water purifier?

Date: 05 Apr 2013   Group: Electronics & Home Appliances    Category: Other Electrical Home Appliances   


I want to buy a water purifier but some of my friends suggested me first to do some research on types of water purifiers available in market. Some of them are of RO type and some UV type. Now what is the basic difference between RO and UV water purification process? And how I should decide the right on to purchase? Also give some suggestion helpful in selection decision.

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Author: [Anonymous]    06 Apr 2013      Member Level: Gold     Points : 5  (Rs 5)    Voting Score: 0

RO and UV type purifier's are common in our market, and before buying a water purifier you should be well known about the differences between these two then you can choose the best for your purpose. RO water purifier means reverse osmosis based water purifiers and UV water purifier means ultraviolet based water purifier. These is a common misconception in our society, that reverse osmosis based water purifiers are better than ultraviolet based ones.

Reverse osmosis water purifier's

We already learned about osmosis from our schools. Osmosis means it is the flow of water molecules from a higher solution concentration region to a lower concentration region through a semi permeable membrane. So RO water purifier works opposite to the osmosis. It moves water molecules from a lower region to a higher region. It works by using the pressure of the water to push it across the membrane. During this process impuriter and dissolved solids will leave behind the membrane.

Ultraviolet water purifier's

Just like the name indicates, these kind of water purifier's are working with the help of Ultraviolet ray's. And this is why UV water purifier's are much better than RO water purifier's. In UV water purifier's the germs and micro organisms will be destroyed with the help of UV rays after the RO stage and delivering a completely pure water.
So in my opinion UV water purifier's are much better than RO water purifier's and you can use RO for your household purposes where high levels of TDS and impurities are present.

Author: Jebaprincy    07 Apr 2013      Member Level: Gold     Points : 5  (Rs 4)    Voting Score: 0

Here is the basic difference between the RO and UV systems.
RO System
In this sytem, water is purified using the Reverse Osmosis technology which is the reverse of coventional osmosis techology. In the RO system, impurities like dissolved solids in the water are removed. Usually 1/3 of the the water is wasted during this process. But the chance of reducing the invisible bacteria and other other micro-organisms is less compared to UV system.
UV system
In addition to the RO system, this UV (Ultra Violet rays are used process is adopted to remove or kill those bacterias, viruses and other micro level organisms. Thus this system is highly purified system compared to RO alone. Hence it is recommended to use but it adds cost too.




Author: Ganesh Babu S    10 Apr 2013      Member Level: Gold     Points : 18  (Rs 16)    Voting Score: 0

What is the use of Reverse Osmosis (RO)?
Water contains ions like Calcium, Magnesium and other essential minerals which our body requires for our day to day activities. I mentioned it as essential as mineral free water should not be drunk by us. In some cases the minerals will be found in excess and might cause some hazards like kidney stone which caused when calcium ion and oxalate ion( found in tomatoes) precipitate. So it is very clear that we need ions, but not in excess. So to remove ions we are opting for RO technology where the excess ions will be removed, make it safer to drink.
Why UV treated water is safe to drink?
UV technology is something where Ultra Violet rays are passed in the water which kills the harmful micro organisms present in it. Remember it can only kill micro organisms and cannot purify or remove ions in water. If you need a water purifier just to kill micro organisms, then you can opt for Pure It or Aqua guard. Both the water purifiers just removes the suspended impurities and kills micro organisms. In Pure It instead of UV, Chlorine tablets are placed to kill the microbes, which is what you see as white piece in battery. Once the Chlorine tablet is over the battery turns red. But both cannot reduce ions.

How to choose a water purifier?
  • It depends on your water quality.

  • It depends on the consumer (Kid or Old person etc.,)

  • The choice of water purifier should solely be decided based on the raw drinking water available in your locality. If you really want to check the quality of water, you can give a sample of the water to some chemical lab near you. They will charge you between Rs.200 to Rs.1000 depending the parameters analysed. If the water contains more ions, then you have to go for RO and if the ions are normal then Pure It itself is sufficient.
    Remember when water is treated with RO, the minerals are removed. If the RO which you are going to buy is removing more minerals, it might cause problem particularly to kids who require more minerals. Consuming mineral free water will drain even the minerals present in your body.
    What is the best water purifier?
    I am not going to suggest you any particular brand, but when you choose a RO, buy the one which has UV attached/ inbuilt with it and also has the feature of TDS control. TDS control gives option to the consumer about how much minerals need to be present in the water. So depending on your needs you can control the TDS yourself.
    Brand Suggestion I personally used Kent RO which is so compact, noise free, has inbuilt UV and TDS control. If the mineral content is normal in your drinking water, just go for Pure It. Its economical as well apt.

    Source : I am a Chemist and analysed these water samples in person.

    Author: Bharath    13 Apr 2013      Member Level: Gold     Points : 10  (Rs 8)    Voting Score: 0

    Ultra violet water purifier (UV) vs. Reverse osmosis water purifier (RO)

    • UV works on the mechanism of making the water borne microbes inactive by exposing them to ultra violet rays.
    • The UV rays cook up the DNA of these microbes, hence rendering them inactive and thus harmless.
    • RO water purifier use a membrane which filters out even dissolved solids and even microbial particles including bacteria and other organics.
    • RO drastically reduces the chance of any germs being present in the water, and hence RO can be truly called a water cleansing process.
    • The other big disadvantage for UV purifier is that it doesn't have the measure for UV intensity which means that the products manufactured loses the ability of disinfection over time due to organics in the water.
    • Here the alternate means of water supply like bore well, tanks etc. suffer from risk of rusting pipes and mixture of soil bound chemicals and germs.
    • With a RO water purifier, filtering of chemicals, germs and microbes is essential to safe guard the health of every member of the family, especially children who tend to be more sensitive to foreign particles in water.
    • Informal studies and surveys done at various locations in and around Delhi have shown that mothers feel safer with an RO water purifier at home, and they find the products worth the money spent.
    • RO water purifiers are expensive compared to UV water purifiers, but a prospective buyer should look at the total cost of ownership as well as health benefits associated with the water purifier type they plan to buy.
    • GENPURE, a leading water purifier brand provides RO water purifiers at Rs. 14500 where are many low end RO purifiers are also available in the range of Rs. 2500 to Rs. 7500.
    • GENPURE products are available in retail market as well as are also available online at following websites are eBay, India times and Shop18.

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