FILSAND, Fltr Sand, .45mm-.55mm 50 Lb. Bag,

Sand filtration continues to make good sense: its cost-to-benefit ratio is very high, and effluent water quality is often very good. Sand systems can filter to a 10 micron level, yet they are simple in design and operation. River washed .44 to .55 mm sand with a high silica content, low impurities and a highly sperical shape for municipal, industrial and residential filter applications.