In reverse osmosis system, pure water molecules come out passing through a semi permeable membrane leaving all impurities, harmful micro organisms and dissolved salts behind whereas in UV rays water purification system ultra violent rays are used to kill harmful micro organisms but the dead bodies of the harmful bacteria present in the water.
Hence RO system or combine systems of RO and UV is good to obtain pure water molecules but not UV rays water purification alone. After gathering all the information about water purifiers we bought AO Smith X7 water purifier a few months ago till now we do not have any issues. It comes with SCMT Silver Charged Membrane Technology and advanced pre filter.
The capacity of it is 9 ltrs and warranty is 2 years. It is user friendly, anyone even kids can use it easily. Make sure the warranty services before buying because I heard some complaints about warranty services but it differs from place to place depending upon the nature of some people.I suggest this product worth buying.