... volume AL2O3%: 18-25% 1. Product Description Ceramic sand filters are doped with rare earth element and processed ... with traditional sands and coal filter material, ceramic sand filters have great advantages as follows:1. Shaped in ... and no harmful substance dissolved out, the ceramic sand filters can ensure the treated water in consistent quality ... ):Φ0.5-1,Φ1-2,Φ2-3,Φ5-6,Φ6-8,Φ8-10,Φ10-12,Φ13-16,Φ16- ...