It also removes hydrogen sulfide and dissolved iron and manganese when followed by mechanical filtration or an activated carbon filter. With ozonation, water is exposed to ozone gas, which destroys microorganisms. Equipment to generate ozone is expensive, and ozonation does not have a residual effect, as chlorination does. Contaminants are removed through filtering and chemical reactions. But the system needs to be regenerated by pouring potassium permanganate into it.
Potassium permanganate can pose a hazard to eyes and skin during handling, so always wear gloves.