FIELD: chemistry. SUBSTANCE: invention relates to composites used for treatment and disinfection of water, among them, in swimming pools. Composite for water disinfection comprising polyhexamethyleneguanidine phosphate, methylene blue and water has alkyldimethylbenzyl ammonium chloride, isopropyl alcohol additionally in the following ratio of components, wt.-%: alkyldimethylbenzyl ammonium chloride, 6-10; methylene blue, 0.05-0.5; isopropyl alcohol, 0.5-1.5; polyhexamethyleneguanidine phosphate, 0.5-2.0; water, the balance, up to 100%. Composite provides annihilation of pathogenic microorganisms and algae, it does not form foam in using. EFFECT: improved and valuable properties, accelerated process of water treatment. 2 ex
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