Chlorinated disinfection by-products (DBPs) in swimming pools are a known health concern, being suspicious for causing allergies, respiratory infections, and some forms of cancer. 

An excellent way to reduce DBPs in swimming pools is the use of UV light and especially medium pressure lamp or the addition of ozone.

Swimming pool UV systems deactivate bacteria, viruses, molds, and their spores drastically, reducing the risk of infection to bathers. In addition, UV systems destroy chloramines, the compounds responsible for the unpleasant smell in pools. UV disinfection becomes an essential element for maintaining the desired water quality in the interaction with chemical and mechanical treatment of water.