Water disinfection by ozone disinfection uses the oxidising property of ozone against micro-organisms such as bacteria, fungi, viruses and algae. Ozone is the strongest oxidant that can be used in water disinfection. The aggressive form of oxygen has proven itself against all germs and micro-organisms in the treatment of drinking and process water. In addition, ozone disinfection has clear advantages over the conventional and frequently used chlorine disinfection of water. This type of water disinfection also decomposes other substances that react with oxygen. These include all humic substances, organic substances, pesticides, cyanides, phenols, or even gases such as hydrogen sulphide.