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Gravel, silica is a silica sand but with a rather large size, of gravel.
Silica gravel Filter Media Is highly effective because of its ability to hold the Deposition Contains impurities. Gravel Also Serves As A Media Support For Filtering Water. There are various size/Size, including: 8″ x 16 mesh, mesh 4 x 8, 3 x 6 mesh, and seterusnys