FIELD: water treatment. SUBSTANCE: to clarify low-turbidity natural water over the cold season, polydimethyldiallylammonium hydroxide, as water-soluble cation-type polyelectrolyte, is used. Treatment is performed by adding aqueous solution of composition containing hydrolyzable aluminum salt and above named polyelectrolyte followed by settling and separating precipitate. Process is applicable for household and drinking water supply systems. EFFECT: enhanced efficiency of process.
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