Ozone cannot only be applied as a disinfectant; it can also aid the removal of contaminants from water by means of oxidation. Ozone then purifies water by breaking up organic contaminants and converting inorganic contaminants to an insoluble form that can then be filtered out. The Ozone system can remove up to twenty-five contaminants.

Chemicals that can be oxidized with ozone are:

• Absorbable organic halogens;
• Nitrite;
• Iron;
• Manganese;
• Cyanide;
• Pesticides;
• Nitrogen oxides;
• Odorous substances;
• Chlorinated hydrocarbons;
• PCB's.