FIELD: methods of treatment of natural underground water. SUBSTANCE: method includes two-stage reverse-osmotic desalting of natural water with introduction into water cleaned of suspended matter, colloidal particles and organic impurities of additions possessing negative hydration, for instance, ammonium iodide or ammonium chloride. EFFECT: higher productivity and selectivity of reverse-osmotic membranes and increased their interregeneration period. 1 tbl
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