The Pentair S7M400 Inner & Outer Cartridge Filter Set (170146) is the OEM replacement cartridge pack for the System 3 S7M400 modular media filter. IMPORTANT: SOLD AS A COMPLETE SET, NOT INDIVIDUALLYThis listing includes both the inner and outer cartridge elements required for your S7M400 filter. Both cartridges must be replaced together as a matched pair for proper filtration performance. These cartridges trap debris as pool water passes through the S7M400 tank, and are sized specifically to nest together as the inner and outer elements of the System 3 modular media filter stack. Separate Cartridges If you need a partial service, here are the separate cartridges: Large Cartridge: 25022-0224S Small Cartridge: 25021-0223S Specifications Pentair Part Number 170146 Part Name S7M400 Inner/Outer Cartridge Pack Part Description S7M400 Inner & Outer Replacement Cartridge Pack Category Cartridges Unit of Measure Pack Fits Into Brand Equipment Line Model / Part Number Notes Pentair System 3 S7M400 Inner/Outer Cartridge Pack Compatibility is based on Pentair parts documentation and available OEM records. This is not an exhaustive list. For certainty, verify the part number in your equipment's manual or on the original part itself before ordering. Poolaroo Pro Tip Replace both the inner and outer cartridges at the same time, even if one appears cleaner than the other — mismatched cartridge ages shorten filter cycles and reduce water clarity. Rinse both elements at the start of each season and whenever the filter pressure gauge rises 8-10 PSI above your clean, start-up reading.
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