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Thread: Can not keep PH down

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    Join Date
    Mar 2007
    Location
    Texas
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    Can not keep PH down

    Need a little help here, My PH will not stay down in the 7.2 - 7.5 range. Every time I turn around it is 7.8 - 8.2 range. Friday I brought it down to 7.2, Saturday it was at 7.5 and today it is at 7.8. I have no aeration system of any kind, and there has been no one in the pool since Thursday. My latest numbers are:
    FC - 4
    CC - 0
    TC - 4
    PH - 7.8
    ALK - 100
    CYA - 40

    So what am I doing wrong?
    27' Round AG, 17,200 gallons, sand filter

  2. Back To Top    #2

    Re: Can not keep PH down

    Bleach or Cal Hypo will constantly push PH up.

    I use a little tri-chlor during the day to keep things steady and it pushes PH down so I get a pretty good balance. Of course I have to closely watch the CYA and adjust chlorine levels from that. Occasionally I drop the water in the pool and replace to keep the CYA levels in a good range.

    Terry
    25k gal painted concrete, 1hp Pentair Wisperflo pump, Pentair Triton II TR100 sand filter, Stingl Safety vacume relief system. Pool Solutions PS232 FAS/DPD test kit.

  3. Back To Top    #3
    JasonLion's Avatar
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    May 2007
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    Silver Spring, MD
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    Re: Can not keep PH down

    Quote Originally Posted by notvaporlocked
    Bleach or Cal Hypo will constantly push PH up.
    Only temporarily. When you add bleach or cal-hypo the PH goes up. But then as the chlorine gets used up the PH comes down again to just about where it started. Long term the effects of bleach and cal-hypo are more or less PH neutral.

    Poolidiot, There isn't normally any need to keep PH down below 7.5. If the PH is stable around 7.7 or 7.8 you might as well let it settle there. That said, lowering your TA will slow the rate that PH increases.
    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

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    keri1973's Avatar
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    Apr 2009
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    Pensacola, FL
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    Re: Can not keep PH down

    Try adding borates. I haven't had to add acid since May.
    18ft. Arcadia Round AGP - 19" Sand Filter, 1 hp pump
    Foam cove/ Gorilla Pad/ Wedding cake steps
    Sta Rite Lil' Shark cleaner and Aquabot Pool Rover cleaner - Aqua-Luminator light and return flow w/fountain attachment
    Added Borates 5/19/09 Taylor K-1005 and Taylor FAS-DPD Chlorine Tests

  5. Back To Top    #5

    Join Date
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    Re: Can not keep PH down

    It does not stay stable at 7.7 - 7.8 , it will keep going up to 8.2 if I do not add acid. So if I do not add acid about every 3 to 4 days it will be back to over 8.
    27' Round AG, 17,200 gallons, sand filter

  6. Back To Top    #6

    Join Date
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    Texas
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    Re: Can not keep PH down

    Quote Originally Posted by keri1973
    Try adding borates. I haven't had to add acid since May.
    Need a little smarts help on this, never used or seen borates. What exactly do I look for?
    27' Round AG, 17,200 gallons, sand filter

  7. Back To Top    #7
    keri1973's Avatar
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    Apr 2009
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    Pensacola, FL
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    Re: Can not keep Pa H down

    so-you-want-to-add-borates-to-your-pool-why-and-how-t4921.html

    This is what I went by, and have had a positive outcome.
    18ft. Arcadia Round AGP - 19" Sand Filter, 1 hp pump
    Foam cove/ Gorilla Pad/ Wedding cake steps
    Sta Rite Lil' Shark cleaner and Aquabot Pool Rover cleaner - Aqua-Luminator light and return flow w/fountain attachment
    Added Borates 5/19/09 Taylor K-1005 and Taylor FAS-DPD Chlorine Tests

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