Circulating water treatment chemicals are mainly used in industrial circulating cooling water systems. They suppress scale deposition and metal corrosion through corrosion and scale inhibitors (containing components such as organic phosphonic acids and polycarboxylic acids), control the formation of microbial sludge with biocides and algaecides (such as isothiazolinones), and form a protective film on the surface of equipment with film-forming agents to reduce initial corrosion. Their core function is to maintain heat exchange efficiency and reduce the frequency of shutdown cleaning. Typical application scenarios include circulating water systems in thermal power plants, petrochemical refining, steel metallurgy, and other fields.