FIELD: purification of sewage and natural water from suspensions. SUBSTANCE: method uses liquid colloidal solution of aluminium hydroxy chloride with characteristic viscosity of 0.03-0.10 cubic cm/g. Said solution is reacted with metal sulfates or chlorides at weight ratio of 1:0.01- 0.7, respectively. The other embodiment of the method uses liquid colloidal solution of aluminium hydroxide with characteristic viscosity of 0.03-0.1 cubic cm/g. Said solution is reacted with natural bischofite at weight ratio of 1: 0.001-1.0, respectively. The present invention makes it possible to improve technical and economic parameters of the method. EFFECT: more efficient purification method. 4 cl, 7 ex, 7 tbl
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