Alford & Lynch Replacement Pool Filter Cartridges to keep it clean and clear all day. Durable and Washable Pleated fabric that supports strength when loaded with sediment. Replacement for Filbur FC-3915, Unicel C-6430, Pleatco PWK30 spa filter Replacement for any 30 sq ft Hot Spring Spas and Watkins Spas and any systems that needs 5 7/8 inch (diameter) by 10 1/2 inch (length) filters TAIPENG Trilobal Fabric: TAIPENG Fabric is a high-quality Trilobal type fabric which has a larger surface area to contain more contaminants than  common fabric. While cleaning, it is easy for Trilobal Fabric to release the contaminants out, so the fabric has a longer service life. Durable and Washable Pleated fabric that supports strength when loaded with sediment. Made with density combined mirco membrane cloth. Large filtration area and dirt capacity, at the same time the filter has a long service life. Alford & Lynch offers you a 100% money back guarantee