Abstract: A composition for preventing formation of slime which comprises a chlorine-based oxidizing agent, a sulfamic acid compound, one of an anionic polymer or a phosphonic acid compound and a process for preventing formation of slime which comprises adding the composition to a water system are disclosed. Troubles caused by slime in cooling water systems, heat-storage water systems, water systems in manufacturing processes of paper and pulp, water systems for collecting dusts and scrubber water systems can be effectively prevented with the composition in a small amount.

Abstract: A composition for preventing formation of slime which comprises a chlorine-based oxidizing agent, a sulfamic acid compound, one of an anionic polymer or a phosphonic acid compound and a process for preventing formation of slime which comprises adding the composition to a water system are disclosed. Troubles caused by slime in cooling water systems, heat-storage water systems, water systems in manufacturing processes of paper and pulp, water systems for collecting dusts and scrubber water systems can be effectively prevented with the composition in a small amount.

Abstract: Metal materials in contact with aqueous systems are prevented from corrosion by a method which comprises adding a copolymer having a molecular weight in the range of 1,000 to 20,000 and formed between isobutylene and at least one member selected from among maleic acid, water-soluble salts thereof, and maleic anhydride to water of such quality that the Langelier index thereof is not less than 1.5 and the relation,(SiO.sub.2).times.(CaH).gtoreq.2,000(wherein (SiO.sub.2) stands for the SiO.sub.2 concentration in the water (mg/liter) and (CaH) for the calcium hardness (mg/liter as CaCO.sub.3 in the water).

Abstract: A water treatment agent to be used by adding it to water systems, such as, those in boiler plant and water cooling circulation system, for preventing both corrosion and scale formation on the metal surfaces held in contact with water in the water systems, comprising, as effective components, a polymer product having maleic acid or maleic anhydride unit and a polymer product having acarylamide or methacrylamide unit.

Abstract: The present invention relates to a slime control agent comprising a bromite substance as an effective component, and a method of controlling the formation of slime by adding a bromite substance to water systems at a rate of 1 to 200 ppm.