... filters are made of refined pottery clays added with certain modifiers, and processed of grinding, mixing ... Globosity; PorosityUnitIndexPore Diameter0.15-39Real Densityg/cm30.9-1.2Bulk DensityT/m30.8-1.2Densityg/ ... its filtering velocity is 15-20m3/h, with small head loss,it lowers filtering tank’s ... area and pore volume; strong decontamination capacity, generally with 9~10kg/m3, it is as 1.2 ~ ...