1.The size can be in 0.1-8mm 2.Can be for advance treatment.eg:oil,city pollution 3.Big void on the surface Ceramic Grain Filterin Filter Material is made of high quality argil. Appended to hole-former and bonder, the granules of spherical shape form after ball grinding, filtering, molding and calcining. The product has even granule, red and brown appearance, flinty and porous surface, interlaced ...