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Thread: pH creeping up

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    pH creeping up

    My pH keeps creeps creeping up, everything else is good. I am putting in 1/2 gal of acid every 2 weeks. Is this normal or is there another problem?

    30,000 gals, fiberglass, bleach
    30,000gal. IG pool - applied fiberglass over gunite when pool was remodeled, cartridge filter, 1HP pump, 100 gal/min flow rate

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    Join Date
    Feb 2008
    Location
    Denton, TX
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    Re: pH creeping up

    What is your TA?

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    JasonLion's Avatar
    Join Date
    May 2007
    Location
    Silver Spring, MD
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    37,879

    Re: pH creeping up

    It is usually high TA, ie using too much baking soda, that causes PH to rise. Lowering TA will usually take care of it, unless you have a really large amount of aeration (large waterfall or negative edge).
    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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    Re: pH creeping up

    CH is 220, TA is 70, I use bleach (6%) for chlorine
    30,000gal. IG pool - applied fiberglass over gunite when pool was remodeled, cartridge filter, 1HP pump, 100 gal/min flow rate

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    Join Date
    Mar 2007
    Location
    San Rafael, CA USA
    Posts
    12,082

    Re: pH creeping up

    So if you want, you can let the TA drop a little more which it will do with your acid additions (i.e. don't raise the TA back up with any baking soda). If the amount of acid you need to add gets less and the rate of pH rise seems to slow down, then you can stay at the lower TA level if you want. Just so you know, half a gallon of acid every 2 weeks, which is 4 cups a week, isn't a lot for a 30,000 gallon pool, but if you're able to lower that by having the TA lower, then that's certainly fine to try. Let us know how it goes.
    16,000 gallon outdoor in-ground 16'x32' plaster pool; Pentair Intelliflo VF pump; Pentair IntelliTouch i9+3s control system; Jandy CL-340 square foot cartridge filter
    12 Fafco solar panels; Purex Triton PowerMax 250 natural gas heater (200,000 BTU/hr output); automatic electric pool safety cover; 4-wheel pressure-side "The Pool Cleaner"

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