Sodium dichloroisocyanurate has a very strong killing effect. At 20 ppm, the bactericidal rate reaches 99%. It can kill all kinds of bacteria, algae, fungi and bacteria. The chemical property of sodium dichloroisocyanurate is stable, the effective chlorine in half a year of storage under dry condition is less than 1%, which is convenient for storage and transportation; it is safe and convenient to use, with less dosage and long duration of efficacy.