Harsco 40 Lb. Bag Glass Filter Media, CGMED-BL
Made from 100% recycled materials, glass filter media cuts down on backwash time as well as loss of pool water and chemicals. Improves water clarity by 25% over sand. Filters down to 5 microns, unlike sand only 30 microns. Use 20% less media (by weight) than with sand. Environmentally sound and last 3 times longer than sand.