Chlorine dioxide (2.33 times heavier than air) is known as a gaseous compound of the halogen, chlorine, and oxygen (ClO2); which has the advantage over pure chlorine that it effects smell and taste perception less and that is also acts as an anti-virus. Chlorine dioxide is also manufactured at special facilities near the production site by combining chlorine gas and/or under-chlorinated acid and a fluid sodium chlorite solution (NaClO2) (10:1). On average 0.05 mg/l – 0.2 mg/l are assumed as average minimum/maximum values.