Ultraviolet (UV) light, specifically the 254 nm wavelength, is a powerful disinfectant. The chief advantages of using UV water systems over chemical treatment are:

• No Residual Chemical or hazardous by-product at the end of the process.
• UV water systems offer a "natural" and "green" choice for disinfection and purification of water.

An ultraviolet water purifier is a simple yet effective way to destroy microorganisms in water. A typical UV water treatment system uses an ultraviolet light to kill microorganisms, and may be combined with a water filter to trap these and other contaminants.