Free Flow Spa (PFF50P4)

The Unicel 5CH-45 hot tub filter has a 2-1/8 inch hole on the top with 1-1/2 inch male MPT threads on the bottom that fits select Freeflow spas models Legend and Passport. It’s best to confirm that this filter is the same size as the existing cartridge in your Legend or Passport spa model before ordering to ensure proper fitment. Filter details: Unicel P/N: 5CH-45 Diameter: 5-5/16" Length: 10" Top: 2-1/8" Open Bottom: 1-1/2" MPT Thread Media: 45 sq.ft. Filter Media: 3oz Pleat count: 225 Compatible replacement for: Pleatco PFF50P4 Master Deluxe M50452 Filbur FC-2401 How long should Unicel hot tub filters last? While most hot tub filters need to be changed every six to twelve months, Unicel brand filters are made with REEMAY premium trilobal filtration media that delivers 45% more surface area over standard rounded filter fibres and can last up to two years or more, depending on your level of use and cleaning routine.