FIELD: water demineralization. SUBSTANCE: in a method including electrolysis of water in diaphragm electrolyzer with separately withdrawing anolyte and catolyte followed by settling the catolyte prior to be combined with anolyte, in order to reduce formation of the sulfate scale on the heat-conducting surfaces when using softened water in heat power plants, electrolysis is conducted with current input from 14 to 327 A x h/cu.m. EFFECT: reduced sulfatation of heat-exchange surfaces.
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