Do you know anthracite coal? It is the most pulverized coal. The anthracite coal has higher fixed carbon, less volatiles. And it is the hardest coal. In the world, there only 10% anthracite coal.
In water treatment, usually tow or three layers' filter media purification, the most using is anthracite filter media. The coal's itself has high pressure, hard and clear.
In industrial water supply, The use of anthracite filter media is determined according to the form of the filter tank. The double layers' filter is generally 300-400mm thickness, and the filtration rate is 10-14m/h. The three layers' filter material is 450mm, and normal rate is 18-20 m/h.
The common using size is 0.6-1.2mm., 0.8-1.8mm, 1-2mm, 1.2-2.4mm, 2-3mm, 3-4mm.
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