Chlorine-containing disinfectant refers to a disinfectant that dissolves in water to produce hypochlorous acid which can kill microbicidal activity, and its kill-microbicida active ingredient is often expressed as available chlorine. The molecular weight of hypochlorous acid is small, and it is easy to diffuse to the surface of bacteria and penetrate the cell membrane into the bacteria, so that the bacterial protein is oxidized and the bacteria die. Chlorine-containing disinfectants kill a variety of microorganisms, including bacterial propagules, viruses, fungi, Mycobacterium tuberculosis, and the most resistant bacterial spores.