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U.S. Silica 50 Pound Mystic White II Swimming Pool Filter Sand, White (4 Pack) ff11red hydraulic cylinder resistance for aThe 4 pack of Mystic White II Swimming Pool Filter Sand by U. S. Silica optimizes your filter's performance for clean and clear water. Graded with a quality, angular shape, these sands provide maximum entrapment of solids, effectively removing leaves, gum, and other litter, leaving you with clean and clear pool water. Specially graded, the formula stops clogging and ensures a uniform flow rate through your filter. Carefully screened and graded, the