Durable polypropylene housing with stainless steel interior treats water naturally without leaving taste or odour. Industry-standard 1/4 in. fittings for versatility and adaptability. Installs quickly and easily for effective POU protection. Maintenance-free, set and forget it design and operation. UV lamp upgrades for RO Systems. The primary usage of UV light is to disinfect filtered water at a certain flow rate. Bacteria, viruses, and other microorganisms are destroyed by the UV interfering with the DNA and RNA in the organisms' reproductive cycles. In theory, the reverse osmosis membrane already removes bacteria and viruses from the water, therefore, if you are on a municipal water system (tap water) in the U.S., chances are that you should not need a UV light on top of our ULTIMATE RO System. But, if your water source is known to be unsafe with microorganisms and you want to have extra protection, then you can add a UV as an additional stage to disinfect water. The ultraviolet Upgrade Kit can be added to any existing RO system or replace an old UV unit.