... Compared with traditional sands and coal filter material, ceramic sand filters have great advantages as follows:1. Shaped in sphere, the ... and no harmful substance dissolved out, the ceramic sand filters can ensure the treated water in consistent quality without and ... strength, N30-150- Water permeability,t/m2.h2-4- Gas permeability,m3/m2h.h1500-2000- Thermal resistance,≥1000- Acid resistance ...