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Thread: Consistently rising pH

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    Consistently rising pH

    Over the last month the pH in my pool has been consistently rising to the point where I need to add Dry Acid on a weekly basis. My numbers are below:

    • FC/CC: 3.5/0
      TA: 100
      CH: 200
      pH: 8.2


    I live in the Northeast where we have had some rain but I don't think it's been more than in past seasons and I don't remember having this issue before. Any ideas why this happening and any ways to prevent it?
    25K Gal, IG gunite, Hayward 1HP pump, Hayward DE filter, Pentair Mastertemp 250, TF100 test kit

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    JasonLion's Avatar
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    Re: Consistently rising pH

    Rising PH is almost always due to higher than ideal TA levels. If you bring your TA level down to around 70, PH increases should stop, or at least slow down dramatically.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
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    Re: Consistently rising pH

    It is not that unusual to have to lower pH once a week. You can try lowering your TA as this should help buffer the pH rise to a certain degree. here is the process...

    pool-school/lowering%20total%20alkalinity

    Switiching to muriatic acid would probably help your case as well.

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    dmanb2b's Avatar
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    Re: Consistently rising pH

    Lower PH to 7.4 with Muratic acid which will also lower TA. TA at 100 is a bit high if you are using Bleach or a saltwater generator for chlorination and may be causing your PH to rise.
    24'x52" AGP (13,500 Gallons), Intex SWG, (2)Solar Bear 4x20 panels, Hayward S220T Filter, 1/2hp Pentair Superflo

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    Re: Consistently rising pH

    Thanks all. I thought 100 TA was good, guess not. So it sounds like I want to lower ph to around 7.0-7.2 and then aerate to raise ph. One more question though when I enter all this into the pool calculator it tells me to add 100oz of dry acid but at the bottom it says 100oz will only lower ph by something like .67. Which is correct?
    25K Gal, IG gunite, Hayward 1HP pump, Hayward DE filter, Pentair Mastertemp 250, TF100 test kit

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    Re: Consistently rising pH

    If your pH is 8.2 and you want to lower it to 7.4 with dry acid, then I calculate using the Pool Calculator that you will need 69 oz. of dry acid to get it there.

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    dmanb2b's Avatar
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    Re: Consistently rising pH

    We prefer MA over dry acid, especially when lowering TA as it add sulfates over time.
    24'x52" AGP (13,500 Gallons), Intex SWG, (2)Solar Bear 4x20 panels, Hayward S220T Filter, 1/2hp Pentair Superflo

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    Re: Consistently rising pH

    Quote Originally Posted by dmanb2b
    We prefer MA over dry acid, especially when lowering TA as it add sulfates over time.
    On top of the fact that it is cheaper and easier to dose as well.

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    Re: Consistently rising pH

    Does anybody have any suggestions on where to get Muratic Acid online? My local leslie's store does not carry it and their website says it's sold in the store only. I see a lot of pool company websites that sell pH reducers that they claim are "better than Muratic Acid" but can't find any that sell actual Muratic Acid. Any suggestions? I have been using Dry Acid instead but given the thread above wanted to switch and try out the MA....thanks!
    25K Gal, IG gunite, Hayward 1HP pump, Hayward DE filter, Pentair Mastertemp 250, TF100 test kit

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    maxepr1's Avatar
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    Re: Consistently rising pH

    Radiation, HD and Lowes sell MA.
    40'x19' IG Diamond Brite 29K 4' Waterfall/Dive Rock FNS60 DE Inteliflo VS 2hp Whisperflo pumps Aqualogic(P4) SWG TF100 Tester


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    Mod Squad Bama Rambler's Avatar
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    Re: Consistently rising pH

    Most of the big box stores have it but it may not be in the pool section it may be in the paint section or the cleaning section.
    Dave J. TFP Moderator
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