METHOD OF WATER SOFTENING Russian patent published in 1997 - IPC

FIELD: water treatment. SUBSTANCE: water is treated with potassium hydroxide and carbonate, deposit is settled, the softened water is separated and neutralized with food phosphoric acid. Potassium hydroxide and carbonate were used at weight ratio = (0.1-1):(0.9-1). Amount of the added additions is calculated by the following equation: (20-70) x H_t- H_res where H_t - total water hardness, mg-equiv./l and H_res - the required residual total water hardness, mg-equiv./l. The softened water is boiled for 3 min, not above. Water is used for drink and food aims. EFFECT: improved method of water softening. 5 cl, 1 tbl