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Thread: Ph and Alkalinity continuing to drift up

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    Join Date
    Apr 2011
    Location
    Pensacola, Florida
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    12

    Ph and Alkalinity continuing to drift up

    I am having a problem with my ph and alkalinity continuing to drift up. Every time I lower the ph to 7.5 it just jumps back up to 8.2 or higher (can't tell higher from the kit) and the alkalinity drifts up with it. I got them both down to 7.5 and 90 respectively but they went right back up. Any ideas about what could be causing this and what I can do about it. I use liquid chlorine. We have had the pool for five years and this is the first time I have had this problem.

    My numbers are
    FC: 4
    CC: 0
    TC: 4
    ph: 8.2 (or higher)
    TA: 120
    CH: 110
    CYA: 50
    Temp: 79
    Pool is 18,000 gallons, vinyl.
    Pool: 18,000 gallons, Cartridge filter, In ground vinyl, Polaris pool cleaner

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    duraleigh's Avatar
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    Apr 2007
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    Sebring, Florida
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    Re: Ph and Alkalinity continuing to drift up

    it just jumps back up to 8.2 or higher
    How long does that take?
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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    Mod Squad JohnT's Avatar
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    Apr 2007
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    SW Indiana
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    Re: Ph and Alkalinity continuing to drift up

    That's pretty normal. You need to follow the Lowering Total Alkalinity

    process in Pool School to get the TA down to a point where the pH stabilizes.
    TFP Moderator
    20K Gallon 20X36 Vinyl Inground
    Hayward S244T Sand Filter with 1HP Whisperflo Pump. Liquidator C-201 and Solar Heat

  4. Back To Top    #4

    Join Date
    Apr 2011
    Location
    Pensacola, Florida
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    Re: Ph and Alkalinity continuing to drift up

    It takes less than a week for it to drift back up. Using the Lowering Total Alkalinity process is going to be my next step but before I do that I thought I would ask if anyone could think of a reason that it is not stabilizing. The last time I went through the process and got it down to ph 7.5 and TA 90, which I thought was in range, it just went right back up. What would be the the number to shoot for to stabilize the alkalinity.
    Pool: 18,000 gallons, Cartridge filter, In ground vinyl, Polaris pool cleaner

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    pwrstrk's Avatar
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    Aug 2012
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    Elverson Pa.
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    4,758

    Ph and Alkalinity continuing to drift up

    I wouldn't go any lower than 70. See what happens at 80. Could be the nature of the beast. If your adding acid once a week that's not over the top. 😎
    Jeff
    24'x54" AG Morada RTR (by wilbar) 13'500 gal. Hayward Powerflo Matrix 1hp 2 speed. Hayward Perflex EC65 DE filter.

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    Re: Ph and Alkalinity continuing to drift up

    The pH can drift up from carbon dioxide off gassing. However, for the TA to rise, something basic has to be added. It could be from fill water if you're adding a lot and the fill water has a high TA. The other possibility is that the liquid chlorine has a lot of excess sodium hydroxide.

    What is your fill water TA?

  7. Back To Top    #7

    Join Date
    Sep 2014
    Location
    Dawson MN
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    13

    Re: Ph and Alkalinity continuing to drift up

    We drained our pool last summer for painting and our fill water is very high in alkalinity, of course alkalinity anchors your PH, so our PH was very high as well. Our alkalinity was 320 ppm and our PH was off the charts. It was a chore and took about four weeks to balance it all out again, but with adding 2 gallons of acid twice a week, constantly testing we have our PH at 7.6 and our TA at 120. It could also be that your chlorine has a lot of sodium hydroxide like the above post stated. What test kit are you using?
    Dawson, MN.,135,000 gallon indoor pool with a sand filter system and a auto-chem feed. I believe it is a BECSYS 3 feeder. The pool is located in a High School and only open from Nov.- Apr. It is also and IG pool I use the Taylor 2006 test kit and love it

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