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Thread: Do I need to lower my PH to close my pool?

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    Join Date
    Feb 2011
    Location
    Northeast OK
    Posts
    14

    Do I need to lower my PH to close my pool?

    FC-8
    TC-0
    TC-8
    PH-7.8
    TA-100
    CH-160
    CYA-55

    Do I need to lower my PH a bit before closing the pool?


    AGP 25,000 gallons
    sand filter
    NE OK
    25,000 gallon
    above ground pool
    sand filter

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    Join Date
    May 2015
    Location
    Quebec, QC
    Posts
    35

    Re: Do I need to lower my PH to close my pool?

    Your pool chemistry looks great to me. If you have an ice cover, any under-ice respiration will increase dissolved CO2 and may reduce your pH slightly, although your Alkalinity should buffer this. I would close as is.
    14 x 28 Jacuzzi vinyl inground pool, Jacuzzi Laser 250 sand filter, Hayward 1 HP pump.

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    duraleigh's Avatar
    Join Date
    Apr 2007
    Location
    Sebring, Florida
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    30,085

    Re: Do I need to lower my PH to close my pool?

    Not sure about the pH but i would lower it. The reports of pH going down in a pool are few and far between.

    Perhaps even more important is to bring your FC to SLAM value.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

  4. Back To Top    #4

    Join Date
    May 2015
    Location
    Quebec, QC
    Posts
    35

    Re: Do I need to lower my PH to close my pool?

    It depends on organics and length of time of a permanent ice cover. If under-ice microbial degradation occurs, over a period of 2 to 3 months, dissolved CO2 cannot out gas to the atmosphere, so the waters will tend to acidify. In addition, the snowpack is acidic, so depending on the amount of snow precipitation, this can be a second source of acidity.
    14 x 28 Jacuzzi vinyl inground pool, Jacuzzi Laser 250 sand filter, Hayward 1 HP pump.

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