It is one of the four methods of disinfection approved by the United States FDA. UV has proven to be a quick, reliable and cost effective method of disinfecting water for both point of use and point of entry. Ultraviolet (UV) is a safe, clean, easy-to-maintain method of assuring that water is free of bacteria. UV Water Purification uses Ultraviolet light, just like sunlight, to kill micro-organisms that may be in the water. It is a proven technology that has no significant drawbacks. In some applications, its initial cost is a bit more than chlorination, but because of its low operating cost, it quickly pays for itself. It is environmentally friendly and essentially trouble-free. Most ultraviolet water treatment systems require only an annual change of lamp – as simple as changing a light bulb – and a periodic change of the filter cartridge.