... , ceramic filter grains enjoy faster filtration speed, longer regeneration cycle, and water output several times higher than that of silicious filter sand ... pool, or be used to treat city water, industrial water and industrial sewage. It can also be used as microbial carrier to form biological ... .5-2. Φ4-6, Φ16, Φ25, Φ32 Ceramic filter grain and sands for waste water treatment