Tier1 Replacement for FC-0359 Waterway 817-0050, Front Access Skimmer, Pleatco PWW50P3, Filbur FC-0359, Unicel 6CH-940 Filter Cartridge AFFORDABLE REPLACEMENT: Replaces cartridges Pleatco PWW50L-M, Waterway 817-4050, 03FIL140. INCREDIBLY SIMPLE TO USE: Easily replaces the old filter cartridge with 50 Sq. ft. media EXTREMELY DURABLE: Measures 13 1/16 inches (length) x 5 inches (outside diameter); Top Handle and Bottom 1 1/2 inch Female SAE FITS THE MODEL NUMBERS: Waterway Front Access Skimmer and Aber Hot Tubs. 100% TIER1 NO WORRIES GUARANTEE: We stand behind the quality of filtration and overall performance of our Tier1 filters! Replace your filter when the pressure gauge on your filter tank reaches 8 psi above the pressure recorded when first installed. Turn off the power to your pump and bleed the excess air pressure of the system using the air valve on the filter. Remove any band clamps and/or lids to your filter. Remove the cartridge from the filter canister and dislodge any loose debris Rinse the cartridge thoroughly with clean fresh water and return it to the filter tank. Secure the tank lid and any band clamps.