... IN SWIMMING POOLS / SPA BATHS Ozone is the second most powerful sterilant in the world and its function is to destroy ... of bacteria, viruses, yeast, molds, cysts, mildew, and most other organic and inorganic contaminants. 6) Ozone in appropriate doses ... other halomethanes in post-chlorine treated natural water. The most commonly encountered contaminants of this type are bromomethanes CHClBr, ...