Chemicals for use in water treatment; descaling preparations other than for household purposes; chemical products for preventing scale; chemicals for the treatment of irrigation water; chemicals for preventing growth of mold, bacteria, colonial hydroids, bryozoans, protozoans, parasites, and mollusks.

Molluscicide; algicides; bactericides; algicides, bactericides, parasiticides, and molluscicides for the prevention and control of mollusks, bacterial odors, algae, and toxic gases in industrial power plants, water treatment plants, lakes, reservoirs, irrigation systems, aqueducts, and other bodies of water.