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Thread: Ph keeps rising

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    Ph keeps rising

    What would cause ph to keep rising? I have twice now used muriatric acid to reduce from 7.8 to 7.4. But it seems to eventually work itself up to 7.8 every few weeks. Is this normal??


    25x16 rectangular in ground pool with vinyl liner (14,000 gal). Sta-Rite sand filter. 1HP single speed Max-E-Pro pump. Pool owner since 2013.

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    Texas Splash's Avatar
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    Re: Ph keeps rising

    Do you have anything that may be aerating your water? Fountain, waterfall, something like that?
    Pat (a.k.a. Texas Splash) ~ My Pool: Viking Fiberglass; 17,888 Gal; Waterway Supreme 2-sp/2-hp pump; Hayward Ctg filter; TF-100 w/ Speed Stir
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    Re: Ph keeps rising

    Just the 2 water returns. Should they be pointed more towards the bottom? Right now they both ripple the top of the water when running.


    25x16 rectangular in ground pool with vinyl liner (14,000 gal). Sta-Rite sand filter. 1HP single speed Max-E-Pro pump. Pool owner since 2013.

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    Texas Splash's Avatar
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    Re: Ph keeps rising

    Pointing up will cause some aeration and could be effecting that PH. I would turn them down a bit and see how that works for you.
    Pat (a.k.a. Texas Splash) ~ My Pool: Viking Fiberglass; 17,888 Gal; Waterway Supreme 2-sp/2-hp pump; Hayward Ctg filter; TF-100 w/ Speed Stir
    Vital Links: POOL SCHOOL, RECOMMENDED LEVELS, RECOMMENDED CHEMICALS, Poolmath Calculator, SLAM, Chlorine/CYA CHART.
    If you enjoyed your TFP experience, please consider donating to Support TFP!

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    Richard320's Avatar
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    Re: Ph keeps rising

    I would consider pH rising from 7.4 to 7.8 every few weeks to be flatlining.

    The natural tendency is for pH to rise through aeration, which includes swimmers. Your pool is behaving normally.
    16K freeform gunite with spa; Pentair 4000 DE filter; Century Whisperflow 1 HP; Pentair Minimax heater.
    Troublefree does not mean Maintenancefree. It's like brushing your teeth: You can spend a couple minutes a day and pennies a week or go to the dentist once a year and spend several thousand dollars.
    A pool is like a pet - you have to feed it every day, even the days you don't want to play with it!

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    JoyfulNoise's Avatar
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    Re: Ph keeps rising

    If you post test results for your water, the folks here can give you more accurate guidance. Rising pH is primarily a function of how high your carbonate level is. Aeration sources definitely increase the amount of CO2 out gassing from the pool but CO2 will naturally outgas on its own even without aeration. So knowing your water test results can help.


    Matt
    16k IG PebbleTec pool, 650gal spa, spillway and waterfall, 3HP IntelliFlo VS / 1.5HP WhisperFlo, Pentair QuadDE-100 filter, IC40 SWCG, MasterTemp 400k BTU/hr NG heater, KreepyKrauly suction-side cleaner Dolphin S300i robot, EasyTouch controls, city water, K-1001, K-2006 and K-1766 test kits, Mannitol test for borates

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