FIELD: compositions for preventing carbonate, sulfate and iron oxide deposits in circulating water supply systems and washing of heat exchange equipment from scale deposits. SUBSTANCE: composition comprises oxyethylidene diphosphonic acid, lignosulfonates, zinc complex of oxyethylidene diphosphonic acid, sulfonate powder which is essentially product of synthesis of sulfonate production and having sodium salts of alkyl sulfonic acids in amount of at least 28% and water, ratios of components being as follows, wt %: oxyethylidene diphosphonic acid, 10-35; zinc complex of oxyethylidene diphosphonic acid, 0-7; lignosulfonates, 0.1-30; sulfonate powder, 0.5-10; and water, the balance. EFFECT: greater prevention efficiency of salt deposits and improved quality of purification and washing of circulating water supply and heat-exchange equipment, and high stability of composition during storage. 1 tbl
