... and sands Widely used as in industrial water, city water, city sewage, pure water Ceramic filter grain and sand high- ... faster filtration speed, longer regeneration cycle, and water output several times higher than that of silicious ... , or be used to treat city water, industrial water and industrial sewage. It can also be used as ... Φ16, Φ25, Φ32 Ceramic filter grain and sands for waste water treatment