RO Vs. UV Water Purifier: Pros and Cons

Reverse Osmosis and Ultraviolet Purification are both the most advanced methods of water purification available today. Now, you know what they are and how they work. But, are you still wondering which one to consider buying for your home since both of them work so differently? We have a list of pros and cons of both these purifiers to help you decide what you’re looking for.

Reverse Osmosis RO Purification


  • RO purification can remove 95-99% of the total dissolved solids (TDS) from water and also the taste and odor of chlorine.
  • It is an inexpensive way to obtain water that tastes like bottled water without actually having to buy a bottle every day! The taste of bottled water is available at your kitchen is the most convenient thing.
  • The taste of water changes to such an extent that families have been provably switched to drinking RO water instead of soda or canned drinks. Cooking with this water can also greatly change the taste of your food.


  • Maintaining an RO purifier is a hassle since the tiny pores of its membrane can get clogged easily and needs to be regularly cleaned or replaced. It is considered a convenience, although an added expense, to buy a pre-filter to prevent the unit from fouling.
  • Costs of replacing the filter, membrane, or sterilizing the system once in a year are high, and not many people can take that kind of investment every year.
  • This process wastes two-thirds of the water is processed, which is a huge downside during the days of water shortage in society.
  • It is a slow process as tap water needs to be pushed through the membrane of the purifier, and the whole step takes time.

Ultraviolet (UV) Purification


  • Ultraviolet purification gains the upper hand over primitive water purification methods like chlorination because of the high levels of toxicity of the latter. Chlorination requires strict scrutiny and attention throughout the whole process, while the process of ultraviolet purification does not.
  • UV purification does not alter the taste of water like RO or chlorination (which gives water a stale taste) does.
  • It is a chemically inactive process. Compared to chlorination that can react with other elements present in water and form toxic compounds, this process is completely nonreactive.
  • Ultraviolet purification uses radiation to kill microbes and pathogens present in water completely and does not require any chemical additives during the process.
  • The process is very quick and can provide drinking water in a matter of minutes. As soon as the radiation touches the microorganisms present in water, they are killed.


  • Water that needs to be treated under UV radiation needs to be filtered first. It cannot contain any color, turbidity, or cloudiness, or else the ultraviolet radiations would not be able to penetrate the microorganisms within, and a large part of it will be absorbed.
  • The process of prior filtering adds to the expense of the process and makes it mandatory that whichever brand of water filter chooses to use UV technology, also has to use some filtering technology as well.
  • UV purification does not persist after the process is over. Any leftover microorganisms in the water will have no way of being removed once the process is done with.

So, there are pros and cons to both kinds of purification technology. Which one would you choose for your home?

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