Explanation

(c)
Ozone is used for purifying water because ozone kills bacteria, cysts, mold ,parasites ,viruses, contaminates etc. It is one of the effective way of eliminating microorganism in the water. Ozone is most effective oxidant. It inactivates and oxidises organic matter, contaminates, pesticides, viruses and bacteria faster than chlorine. Ozone do not form TMH which have unpleasant odour and also carcinogenic. Ozone is very good biocide, ozone also absorts UV radiation.