Sand filters are used for water purification. Cairo Minerals Offer Pool Filter Sand and Pool Filter Gravel With Different Grades (0.4 mm-0.8 mm) (0.7 mm-1.125 mm) (1 mm-2 mm)(2 mm-3 mm)(3.15 mm-5.6 mm). We pack Gravel and Silica Sand into Small bags on 25 Kg made of polypropylene.
