Ultraviolet technology is becoming more widely used in the swimming pool industry as an environmentally friendly addition to chemical disinfectants and is the standard for most newly built pools. UV works automatically to control pathogens that are difficult to destroy with chlorine or have become resistant to it.

The primary action of UV is to kill bacteria, viruses, molds and their spores reducing exposure to bathers. It also initiates reactions that destroy chloramines the compounds responsible for, skin and eye irritation and unpleasant odors.