Folding Design--More pleats mean improved filtering capacity.Triple laminated poly-constructed inner scrim is topped by weather top coating,Break keeping the pleats crisp, clearly defined and evenly separated. Part Number--Compatible with for following: PWW50 /PWW50P3-M/PWW50P3, 6CH-940/6CH-940RA, FC-0359, Waterways 817-0050 Filters ,817-0050, 03FIL1400, 25252, 378902,Aber 03FIL1400,SD-00710.The part/product is not sponsored or endorsed by,or affiliated with the it fit,including for , , Waterways, Aber. Material: PP polyester material,has strong dirt absorption capacity high temperature resistance, resistance.-duty polyester makes the capable of lasting longer than cheaper alternatives. Upgrade --This blue filter paper should make the white filter paper and more efficient to clean dirty water. with 1-1/2inch SAE thread. Media Area: 40 sqft.(About 4 ounces per square yard means more fibers per unit of area for better dirt trapping power). Wide Compatibility--Compatible with most indoor/outdoor, inground, above-ground swimming pools, , and spas. Aftermarket .This is a compatible spare part,part number and other manufacturers' name are just for reference.