... and sands Widely used as in industrial water, city water, city sewage, pure water Ceramic filter grain and sand high-quality pot clay, ... material to remove 16 mateirals in water including organic ammonia and nitrite.Chemical composition of ceramic filter grains: NameSiO2Al2O3Fe2O3CaOMgOKO2+Na2OLoss on ... 0.5-2. Φ4-6, Φ16, Φ25, Φ32 Ceramic filter grain and sands for waste water treatment