... porosity, etc. Under the same conditions, ceramic filter grains enjoy faster filtration speed, longer regeneration cycle, and water output ... be used as filter material in slow filtration pool, fast filtration pool, monolayer filtration pool or multi-layer filtration pool, or be ... -03.262.043.226.42Main technical indexes of ceramic grains: Itemreddish brown microporous ballsPore diameter0.11-35mmApparent ...