... amount of pollutant entrapment, less water head loss in the filter bed, lower consumption of back-flush water, stable in chemical ... service life. Ceramic grain filters is a new and efficient filter material to increase the water yield, upgrade the water quality ... ~8, Φ8~9, Φ9~10, Φ10~12, Φ13~15, Φ16~20, Φ21~60. Filter