It is a disinfectant which is dissolved in water to produce hypochlorite which has the activity of killing microorganism, and its active ingredient is often expressed by effective chlorine. Hypochlorite molecular weight is small, easy to spread to the surface of bacteria and penetrate the cell membrane into the bacteria, so that the bacterial protein oxidation caused the death of bacteria. Chlorine-containing disinfectants can kill a variety of microorganisms, including bacterial reproduction, viruses, fungi, Mycobacterium tuberculosis and the most resistant bacterial buds. Such disinfectants include inorganic chlorine compounds (such as sodium hypochlorite, calcium hypochlorite, trisodium phosphate), and organochlorine compounds (such as two sodium chloride, cyanuric acid, ammonium chloride, etc.). Inorganic chlorine property is unstable, susceptible to light, heat and humidity, loss of its active ingredients, organic chlorine is relatively stable, but dissolved in the water after the instability.