Pureline Replacement Cartridges for Sta Rite System 3 S7M120 Filter (Inner & Outer)

PureLine Aftermarket Replacement Cartridge for System 3 Mod S7m120 Filters Is your pool water starting to look a little dull? Is your pressure gauge reading a higher PSI than normal? Are your pool jets a little less powerful? These are all signs that it is time to replace your pool filter cartridge. Replace your pool filter cartridge today and regain that crystal clear pool water and extend the life of your pool pump. Typically for single cartridge pool filters we suggest replacing your cartridge every 6-12 months and for filters which take multiple cartridges, we suggest replacing your cartridges every 3 years.