... the water treatment,no harmful for health. Pingxiang Petrochemical Filteration material of ceramic sand are made of refined pottery clays added ... long service life,Ceramic sandis a new and efficient filter material to increase the water yield,upgrade the water quality,and ... ball,porous,red&brown Diameter,mm0.5-30Apparent Density,g/cm31.2-1.6Bulk density,g/cm30.6-1.2Total porosity,% 60 ...