Part Number--Compatible with for following: PWW50 /PWW50P3-M/PWW50P3,Unicel 6CH-940/6CH-940RA, Filbur FC-0359, Waterways 817-0050 Hot Tub Filters ,817-0050, 03FIL1400, 25252, 378902,Aber Hot Tub 03FIL1400,SD-00710.The part/product is not sponsored or endorsed by,or affiliated with the brands it fit,including for Unicel, Filbur, Waterways, Aber. Material: PP polyester material,has strong dirt absorption capacity high temperature resistance, corrosion resistance.The heavy-duty polyester makes the cartridge capable of lasting longer than cheaper alternatives. Folding Design--More cartridge pleats mean improved filtering capacity.Triple laminated poly-constructed inner scrim is topped by a premium weather resistant top coating,Break resistant keeping the pleats crisp, clearly defined and evenly separated. Upgrade --This blue filter paper should make the white filter paper safer 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, hot tubs, and spas. Non original Aftermarket .This is a compatible spare part,part number and other manufacturers' name are just for reference. Colour: blue Material: plastic Size: 24.3 x 15cm Package Contents: 6 x Spa Filter