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Thread: Pressure buildind quickly

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    Pressure buildind quickly

    I have a jacuzzi filter for about three years (bought it used) and for the first three years it would run at about 15 to 18 psi. When the pressure would build to 22 to 25 I would backwash. This build-up used to take a few weeks at least. Now I backwash at 22, it will drop to about 18 at the lowest but will build back up to 22 to 25 in about two to three days. Is this a problem, is there a solution?
    Thanks in advance
    32x16 in-ground vinyl
    18,000 gallons
    Sand Filter, 1.5 hp
    One skimmer, main drain feed, 3 returns
    Auto Chlorinator (pucks,not in use)
    Using The Liquidator
    Austin, TX

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    Re: Pressure buildind quickly

    if its sand, change sand
    if its de, change de
    if its cartridge, install new cartridge
    24,000 gallon ig fiberglass pool
    1 hp hayward pump
    hayward sand filter (250 lb)
    madisonville, ky

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    Re: Pressure buildind quickly

    Is this a problem, is there a solution?
    Yes and Yes.

    I think there is a good possibility you have algae.

    Do you know how much FC you are losing daily? Do you know your CYA?
    Dave S. - Forum owner
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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    Re: Pressure buildind quickly

    Sorry yes it is sand, and the chlorine levels hold just fine have a puck feeder on lowest level and water is crystal clear. Even the backwash water seems clear. CYA was about 40ppm last time I checked.
    32x16 in-ground vinyl
    18,000 gallons
    Sand Filter, 1.5 hp
    One skimmer, main drain feed, 3 returns
    Auto Chlorinator (pucks,not in use)
    Using The Liquidator
    Austin, TX

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    duraleigh's Avatar
    Join Date
    Apr 2007
    Location
    Sebring, Florida
    Posts
    28,401

    Re: Pressure buildind quickly

    If the pressure is building, it is because particles are being trapped in the filter. It is unlikely to be dirt because that is fairly visible.

    It is very likely to be algae. Algae does not have to be visible.

    You still don't say how much FC you are losing daily which will give us a hint.

    The best way to tell is to do an overnight FC loss test which you can only do with a precise FAS/DPD test.
    Dave S. - Forum owner
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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