... and sintering, Compared with traditional sands and coal filter material, ceramic sand filters have great advantages as ... follows:1. Shaped in sphere, the ceramic filter sand has a high void space, normally, its ... size, make it easy to be cleaned, the back-flush strength is 12-20 l/m2.s; it can ... quality without and secondary pollution may cause by the filter as quartz sand or coal filters itself. 2 ...