At present, the common disinfection commodity of swimming pools in China is sodium dichloroisocyanurate. It is the leading new high-efficiency swimming pool disinfectant in China. It has chlorine-based and oxygen-based sterilization and disinfection properties. It can powerfully kill various pathogenic microorganisms such as cell spores, bacterial multipliers, fungi and has a special killing effect on hepatitis viruses and prevalent liver viruses. It can quickly kill algae such as blue-green algae and red algae. The efficacy is stable and lasts a long time. The disinfection of sodium dichloroisocyanurate can be 50 ~ 85 times that of sodium hypochlorite. The dosage is less, the usage is simple, no residual poison and side effects, and it is safe for people. Sodium dichloroisocyanurate is an ideal swimming pool disinfectant nowadays.