Glass ceramic ring with high quality quartz sand as raw material, after high temperature calcination, with stablechemical properties.Quartz sand filter material, good acid & alkali resistance, uncontaminated, high density, stroncload carrying capacity, Glass ceramic ring with high permeability pore structure, can provide a large specific surfacarea for the attachment of beneficial bacteria breeding, effectively reduce the ammonia and nitrite in the water.Thischemical inert ceramic filtering material is fresh water, sea water and pond ideal filter mediumMaterial:Quartz powder Production:1800℃high-temperature calcination