1 Liquid chlorine and chlorine gas: these are widely used in large-scale tap water plants at present, and can be supplemented with chlorine adding machines. The cost is the lowest, and large water plants are widely used.
2 chlorine dioxide generator: many small and medium-sized water plants are in use, and the cost is moderate, but the raw material sodium chlorate hydrochloride is hard to buy.
3 Chlorine dioxide finished agent: a substitute for sodium chlorate hydrochloride, which has a good and stable disinfection effect, is being vigorously promoted at present.
4 electrolytic salt generator: the raw materials are easy to buy, the equipment maintenance cost is high, and it is also used by many water plants.
5 Other ozone and ultraviolet rays are used in small water plants, and the effect is average.
The use of bleaching powder, trichloro and dichloro in six remote areas and water plants has been banned by the state.