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Thread: Low pH

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    WestSidePool's Avatar
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    Low pH

    For the longest time my pH tends to fall and maintain it's levels around 6.8 or so ppm.
    If I aerate, or add borax I can get it back up to 7.2+ but within a few day's it falls back down.

    What could be causing this, is it a problem, and how do I deal with it?

    TA-70
    CYA-50-70 (just added stabilizer on monday)
    Eric

    IG 17x33 Grecian - Vinyl Liner (21k gallons), Hayward Pro-Grid DE 4820 filter, Hayward Super Pump, CompuPool SWG CPSC36, TF-100 Test Kit

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    Re: Low pH

    Are you using trichlor pucks?

    CYA has an acidifying effect, see the Pool Calculator, Effects of adding Chemicals.
    23,000 gallon in ground pool with rock waterfall and spillover spa, Aqualink control system, Polaris 380 cleaner, Purex Triton Clean&Clear Plus cartridge filter. Located in The Woodlands, Texas.

    Pool owner since Nov 2008, Trouble Free since April 2009. Happy to help when I can.

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    Puffin's Avatar
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    Re: Low pH

    As I understand it, the TA goals are good targets for everyone. But at the end of the day we need to make adjustment for our specific cases. If 70 might be too low for your situation. Try raising it gradually, to see if your ph stabilizes.

    In my situation, I have a TA of 130 and my pH is very stable (no detectable change is more than a month). The only time its moved is when I've done something to it (like add CYA, and when I added borates)

    I know that's higher than the recommendation, but I'm lazy. To lower TA, you add acid. To lower pH, you add acid. So, I just planned to kill two birds with 1 stone as when the pH needs to be lowered, I'll add acid which will also lower the TA. Sure this is a very slow process, but again, I'm being lazy. To my surprise, I've not need to lower my pH at all.
    19,600 gal, Vinyl, Grecian L, StaRite Dura-Glas 1 HP pump, 3/4hp booster, Pentair Clean and Clear 420 Cartridge filter
    The Pool Cleaner 4x, PoolSkim

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    WestSidePool's Avatar
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    Re: Low pH

    No, I used liquid chlorine for the longest time, and just recently switched to a SWG.
    I was trying to get my numbers in line for the SWG and everything seems to be holding except the pH.

    It's possible it's the CYA causing it.
    I just added 2 lbs monday like i said.

    We also keep the solar cover on when it's not in use. Could this also contribute to the lower of the pH?
    Eric

    IG 17x33 Grecian - Vinyl Liner (21k gallons), Hayward Pro-Grid DE 4820 filter, Hayward Super Pump, CompuPool SWG CPSC36, TF-100 Test Kit

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    JasonLion's Avatar
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    Re: Low pH

    A solar cover prevents most of the usual PH increases that are common with a SWG.

    If you have ongoing problems with PH falling, raise your TA level.
    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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    Puffin's Avatar
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    Re: Low pH

    I don't have a SWG (yet, maybe pool Santa will fix that), so I don't know if this is normal. Sounds like it might be, I know SWG cause the pH to drift up. Setting up your chemistry to counter that makes sense.

    But what I can say is according to the pool calculator 2lbs of stabilizer in 21000 gallons water will lower the pH by .21
    19,600 gal, Vinyl, Grecian L, StaRite Dura-Glas 1 HP pump, 3/4hp booster, Pentair Clean and Clear 420 Cartridge filter
    The Pool Cleaner 4x, PoolSkim

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    WestSidePool's Avatar
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    Re: Low pH

    Over the weekend I made myself an aerator out of PVC.
    I used some of the ideas I saw while browsing TFP.



    I was able to get my pH up in less than a day.

    I'll monitor it and see if it stays, drops or rises.
    Eric

    IG 17x33 Grecian - Vinyl Liner (21k gallons), Hayward Pro-Grid DE 4820 filter, Hayward Super Pump, CompuPool SWG CPSC36, TF-100 Test Kit

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