Tier1 Replacement for Sta Rite PTM70, T-70TX, Pleatco PSR70-4, Filbur FC-2540, Unicel UHD-SR70 Pool and Spa Filter AFFORDABLE REPLACEMENT: Replacement PTM70 filter for 70 sq ft Pool and Spa systems that need 8 11/16 inch (Outside diameter) by 18 3/16 inch (Length) filters. INCREDIBLY SIMPLE TO USE: Easily replace your old PSR70 pool filter, WC108-57S2X pool filter with the Tier1 PTM70. EXTREMELY DURABLE: Durable and Washable Pleated fabric that maintains strength even when loaded with sediment, our high flow core is designed to support the filter while providing industry leading flow rates while causing less wear and tear on your pump POOL AND SPA FILTER CARTRIDGE REPLACEMENT: This Tier1 Sta Rite PTM70 can be used in place of your PSR70 pool filter 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.