The main component of the bactericide and algaecide is dodecyl benzyl ammonium chloride, which has stripping, dispersing, and penetrating effects on sludge. It can effectively kill bacteria within different pH ranges and also has certain oil-removing, deodorizing, and corrosion-inhibiting properties. This product can be used to control microbial and algal proliferation and slime growth in circulating water systems, effectively inhibiting algal reproduction and slime accumulation.