FIELD: filtering materials used in water treatment plants. SUBSTANCE: manufacture of filtering material from anthracite includes treatment with of 0.5- to 2.5-% hydrofluoric acid and 5-% hydrochloric acid at volumetric ratio of 1: 1 during 0.5 to 1 h followed by washing-off with water to neutral reaction. Ash content of filtering material ranges from 3.6 to 6.3 at intergrain porosity of 50 to 52 %. EFFECT: enhanced efficiency. 1 tbl, 5 ex
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