FIELD: cleaning water. SUBSTANCE: device has tank provided with two beds for treating water in two stages. The first bed is made of schungite containing 30-70% of silica and aluminosilicate. The second bed is made of dolomite containing no more than 0.1% by weight, of organic components, 1.5-2% of sulfur, and 0.3-0.6% of nitrogen. The device can be submerged. In this case, the tank comprises two parts. The first part contains layer made of schungite. The second part has layer made of dolomite. At least a section of surface of each part is made of a porous material. EFFECT: enhanced efficiency. 3 cl, 3 dwg
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