Response to The ideal pressure on the Clean and Clear Cartridge Filter 150 Sq. Ft. or any other filtration unit depends on several factors such as hp of pump, water flow and plumbing size. This filter has a maximum PSi of 50, so with a dirty  filter you don't want the filter to exceed 50 PSI. The lower the pressure the more efficient the filter will be and the longer it will last, so you always want to go with a larger than normal unit.

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