... treatment,no harmful for health. Pingxiang Petrochemical Filteration material of ceramic sand are made of refined pottery clays added with certain modifiers ... stable in chemical and gbiologic property,and long service life,Ceramic sandis a new and efficient filter material to increase ... 41-43-5Thenical dataItem Index Appearance Rough ball,porous,red&brown Diameter,mm0.5-30Apparent Density,g/cm31.2-1. ...