... specific surface area and porosity, When used in water treatment, they behave a activated surface property, a great ... amount of pollutant entrapment, less water head loss in the filter bed, lower consumption ... filters is a new and efficient filter material to increase the water yield, upgrade the water quality, and save ... Φ10~12, Φ13~15, Φ16~20, Φ21~60. Waste Water Treatment Product