"it has become the oxidizer of choice to solve many problems in potable water, including: --Preliminary oxidation to reduce the formation of chlorinated hydrocarbons (THMs and HAAs) during chlorination --***Oxidation of dissolved manganese and iron to form insoluble manganese or iron, which can be removed. Chlorine dioxide oxidizes manganese to its insoluble state without going all the way to soluble permanganate***... --Inactivation of Giardia and Cryptosporidium (parasites) --Secondary disinfection of water systems to control/remove biofilm and Legionella"