Pentair 25022-0203S Large Outer Cartridge Replacement Sta-Rite System 3 SM-Series S8M150 Pool and Spa Cartridge Filter Large outer cartridge replacement Fits Pentair Sta-Rite System 3 SM-Series 25-inch pool and spa cartridge filter model S8M150 259-square feet filtration area Measures 23-1/2-inch length by 23-inch height by 23-inch width