Tier1 Replacement for Vita Spa Duet 179192, Pleatco PVT25N, Filbur FC-0186 Antimicrobial Spa Filter Cartridge for Vita Spa Duet Systems AFFORDABLE REPLACEMENT: Replacement Vita Spa Duet filter for 25 sq ft Vita Spa Duet Spas and any systems that need 4 3/8 inch (Outside diameter) by 7 5/8 inch (Length) filters. INCREDIBLY SIMPLE TO USE: Easily replace your old PVT25N-P4 with the Tier1 179192 filter. 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 FITS THE MODEL NUMBERS: This Tier1 179192 filter can be used in place of your PVT25N 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.