TwinOxide® works on the biocidal component chlorine dioxide. Although chlorine can be found in the name, it is NOT a chlorine type of disinfectant. TwinOxide® does not release free chlorine (hypochlorous acid) to provide a biocidal function. When TwinOxide 0.3% solution is applied, the active substance has a full spectrum of efficiency against bacteria, algea, funghi, protozoan, yeast, methanogens and viruses.