... Large Surface Area,easily packed ISO9001:2008 Filtration materials of porcelain sand has the merit of steady function, ant-blasting, ... come out SiO2 and leave over liquid coal.Ceramic sand filter chemical Composition: ChemicalSiO2Fe2O3MgOAl2O3CaOK2O+Na2OContent68-74%0.10%0. ... to water quality and special fabrication processing, the porcelain sand filter material is able to free from iron, Mn, fluorine ...