FIELD: technology of waters treatment. SUBSTANCE: method involves addition to polluted water 3-10% an aqueous suspension of alkylcarboxysiloxanes modified by phosphonic groups of the general formula: 
wherein R' is 
wherein A and B mean 
-COOH wherein x = 0-16; 
-COOH wherein y and x = 0-16, and C is 
or H; R'' is 
-PO(OX)(OY) wherein X, Y mean H, Na, K; d = 0-16. Method provides effective treatment from radionuclides and cations causing water hardness at retention of high degree of purification from iron, heavy and nonferrous metals. Invention can be used for effective extraction of radionuclides and for reduction of water hardness. EFFECT: improved treatment method. 3 ex
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