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Thread: Replace filters?

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    Replace filters?

    I have a cartridge filter and wanted to understand when I should replace it. There are actually 4 filters, I clean them a couple of times a year and they appear to be in decent shape. I've had the pool for 2 years, so I don't know how old the filters are.


    10,000 gallon inground gunite pool
    1.5 HP 2-speed Hayward pump
    Polaris pressure-side cleaner
    Houston, TX
    Houston-area (Katy, TX)
    10,000 inground plaster pool
    1.5 HP, 2-speed Hayward
    Cartridge Filter
    400k BTU gas heater
    E-Command 4 automation

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    JasonLion's Avatar
    Join Date
    May 2007
    Silver Spring, MD

    Re: Replace filters?

    Filter cartridges should be replaced when even a through cleaning and detergent soak do not return them to at least close to the original clean filter operating pressure. Cartridges will usually go many years before being replaced, as long as they don't develop tears.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
    Creator of PoolMath and Pool Calculator. Other handy links: Support this site, TF Test Kits, Pool School

  3. Back To Top    #3

    Re: Replace filters?


    I am still using the original cartridges (6 years) in my Pentair Clean and Clear 520. I clean them once a year in the spring, and don't get any significant pressure rise over the course of the year. My pool is pretty small (15k gallon in-ground) and I use a variable flow pump. I have never seen any tears, and the bands are all still connected to the pleats. I have been thinking about replacing them just due to their age, but after reading your comment above, maybe not. I would appreciate your thoughts.

    Also, when it comes time to replace, do you have any thoughts about Pleatco vs. Unicel vs. Filbur?
    15,000 gallon IG pebble pool/spa | Pentair 400k BTU heater | Pentair cartridge filter | Goldline AquaRite SWG T-Cell-15
    Pentair IntelliFlo Variable Speed Pump | 3 Pentair Whisperflo pumps (1-2 HP) | Hayward Aquabot | Pentair Intellitouch controls

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    Melt In The Sun's Avatar
    Join Date
    Oct 2009
    Tucson, AZ

    Re: Replace filters?

    This will be the 8th year for mine, and I'm not replacing them until I have to! I haven't heard any complaints about any of the filter manufacturers; I think they're all pretty much the same.
    11,200 gal, Pebble-Tec; Tristar 2-speed 1hp - Swimclear 325 ft2 cart - SWG - A & A in-floor cleaner - Heat pump. For the poolside cooking, a Yoder Wichita and a Big Steel Keg!
    TF Test Kits -- PoolMath -- Pool School
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