... and sands Widely used as in industrial water, city water, city sewage, pure water Ceramic filter grain and sand high-quality pot clay, additive ... filtration speed, longer regeneration cycle, and water output several times higher than that of silicious filter sand, and it can save 35 ... specificationΦ0.5-2. Φ4-6, Φ16, Φ25, Φ32 Ceramic filter grain and sands for waste water treatment