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Reverse Osmosis Advantages and Disadvantages

Reverse Osmosis Advantages

  1. The ability to remove many dissolved substances efficiently, yet produce a good tasting finished water, is one advantage of reverse osmosis.
  2. Another advantage is that RO does not add any other chemical to your water. It merely separates the dissolved substances from the incoming water.


Reverse osmosis has several disadvantages that make it impractical for treating all of the water entering your home.

  1. The primary disadvantage is the amount of water wasted by the process.

    Expensive process with slow output 

    Limited to pre-filtered water, must be combined with another water treatment device

    Does not disinfect water to make it pure and clear

    For each gallon of water produced, between 2-20 gallons of water are lost as waste.

    Reverse osmosis units can be expensive. Cost of a unit along with installation may run from several hundred to one thousand dollars or more. 

    The RO membranes are subject to decay and require periodic  replacement. As they decay, the quality of the treated water becomes poorer.

    Hard water can shorten the life span of the RO membrane. A water softener might be necessary to keep the membrane working at its best.

    Reverse osmosis units should not be used to treat water that contains harmful microorganisms.

    Small holes in a worn membrane can allow microorganisms to pass through with the treated water.

UV Rays Treated water

A source of UV rays (generally a quartz bulb), protected by transparent housing, is immersed in a container. The exposure to the UV rays modifies the DNA of the micro-organisms and prevents them from reproducing.


  • The most effective way to eliminate bacteria, virus and coliforms
  • A simple and natural process with no chemical additives
  • Require minimum cleaning and maintenance
  • Preserves the water's taste and quality


  • Water treated with UV rays cannot be preserved for long periods 


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Please note that this is the opinion of the author and is Not Certified by ICAR or any of its authorised agents.