Silica Sand 20/30 grade; 50 lb. Bag A high purity, graded silica sand often used for artificial turf landscape infill as well as gravel, a concrete additive, or for other residential, commercial and industrial sand uses. Closely graded silica sand 20-30 U.S. sieve size. How much infill do you need? A general rule of thumb is 1 lb. per square foot of artificial turf.
