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Replacing a Cartridge Filter
How can I tell when a cartridge filter element needs to be replaced?
With no moving parts or electrical switches to fail, cartridge elements do not have a defined termination point. Instead the fine interstices of the media matrix gradually plug up over time. In a typical spa, the culprit that plugs the media is perspiration and body oils combined with soaps, chemicals and very fine particulate. In a swimming pool, the loading is primarily debris along with sun tan lotions and organic matter such as algae.

Assuming the filter is properly maintained and correctly sized to the pump, determining when the cartridge is exhausted depends primarily on three factors:

All three are dependent upon proper pool or spa water chemistry and following a routine maintenance schedule. Homeowners should be reminded that filter elements are plastic and should be handled and maintained accordingly.

To maximize the life of a cartridge I suggest:
• Clean the elements per cleaning instructions.
• Never use a stiff brush to scrub the media.
• Maintain pool or spa water chemistry in proper balance.
• Do not allow the differential pressure to go over 8 psi between   cleanings.
• Alternate two sets of cartridges when cleaning.