... high porosity, etc. Under the same conditions, ceramic filter grains enjoy faster filtration speed, longer regeneration cycle, ... used as filter material in slow filtration pool, fast filtration pool, monolayer filtration pool or multi-layer filtration pool, or ... organic ammonia and nitrite.Chemical composition of ceramic filter grains: NameSiO2Al2O3Fe2O3CaOMgOKO2+Na2OLoss on ignitionContent59.8816-251- ...