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Thread: When is it time for a new cartridge filter? High PSI

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    Join Date
    Jan 2011
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    Houston, TX
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    When is it time for a new cartridge filter? High PSI

    Hello,

    I have gotten into a cycle where my pump pressure gets up around 30-32 psi and then it is time to clean the cartridge filter. I hose it down and then it goes down to 20 psi. Then 2 weeks later it is back to 30-35!

    My pool is crystal clear, pump runs about 10 hours a day, and I have shocked it to ensure there is no FC. Since the pressure keeps going up, is this an indication a new filter is required?

    We have been in the house for 2.5 years and I am not sure of the maintenance of the filter before that point.

    When you replace a filter, is it strictly on a yearly, 5 yearly, etc schedule... or is it time to replace it when you get high PSI ratings that wont go down with a clear pool?

    CYA is around 50, TA, PH at normal levels.

    Thanks, Aaron
    15'x30' 10K gal, in-ground, cartridge filter, waterfall, spa, The Pool Cleaner, Purex Triton 250 heater, pool built ~1999.

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    frustratedpoolmom's Avatar
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    May 2007
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    SWSuburban Chicago, IL
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    Re: When is it time for a new cartridge filter? High PSI

    You shocked it to make sure there is no FC? You mean CC, yes?

    Assuming your normal levels are in line with our recommendations, I would say your guess is a good one. How many sf is the filter?

    Cartridge Filters can last 4, 5, 6 years depending on their use (were they used to clear a swamp, etc.) and how they were maintained (cleaning routine - see Pool School article on cleaning cartridges). If they weren't used for a swamp and were cleaned and stored properly yes it extends their life. I would say your's is probably done.
    Helpful links: Pool School; CYA/Chlorine Chart
    24' round AG pool, 52" high, Raypak heater; Waterway 2 spd Pump;
    150 Sq ft. Clearwater Cartridge Filter; Former and DISSATISFIED "Pool Frog" owner
    http://www.PerfectlyClearPoolService.com

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    Join Date
    Jan 2011
    Location
    Houston, TX
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    Re: When is it time for a new cartridge filter? High PSI

    Yes - sorry meant to say no CC. Whoops!
    My other levels are ph = 7.5, TA = 110, CH = 220.

    I'm in Houston, so I don't close the pool for the winter - so the cartridge filter stays in year round.

    Thanks for the quick reply - so generally a high PSI that does not stay down after filter cleaning (assuming pool levels are good) is the way to tell if you need a new filter?
    15'x30' 10K gal, in-ground, cartridge filter, waterfall, spa, The Pool Cleaner, Purex Triton 250 heater, pool built ~1999.

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    frustratedpoolmom's Avatar
    Join Date
    May 2007
    Location
    SWSuburban Chicago, IL
    Posts
    11,965

    Re: When is it time for a new cartridge filter? High PSI

    Yes.
    Helpful links: Pool School; CYA/Chlorine Chart
    24' round AG pool, 52" high, Raypak heater; Waterway 2 spd Pump;
    150 Sq ft. Clearwater Cartridge Filter; Former and DISSATISFIED "Pool Frog" owner
    http://www.PerfectlyClearPoolService.com

  5. Back To Top    #5

    Join Date
    Jan 2011
    Location
    Houston, TX
    Posts
    56

    Re: When is it time for a new cartridge filter? High PSI

    I just wanted to update you, I soaked the filters in muriatic acid for 45 min and the psi went down from 35 to 16! Will keep an eye on it and let you know.
    15'x30' 10K gal, in-ground, cartridge filter, waterfall, spa, The Pool Cleaner, Purex Triton 250 heater, pool built ~1999.

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