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Thread: High MA Usage

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    phalcon51's Avatar
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    High MA Usage

    I've been having to add about 32 oz. or more of MA roughly every 3 days to keep my pH between 7.5 and 7.8. The pool was re-plastered in Sept. 2010, so about 7 mos. ago. Just wondering if this would be considered excessive and what I should do about it.

    Latest test results from my Taylor K2006:

    FC - 5
    TC - 0
    pH - 7.8
    TA - 80
    CH - 300
    CYA - 60
    Salt - 3550
    Temp - 72

    Thanks for any help,

    Gary
    26,200 gal. 35' x 16' Plaster IGP (50 yrs. old), Hayward 48 sq. ft. DE filter, Hayward EcoStar VS pump, Intellichlor IC-40 SWCG, The Pool Cleaner 4X suction, Pool Skim and Pool Devil skimmers. Re-plastered Sept. 2010.

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    XsAllOverIt's Avatar
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    Mount Airy, Maryland
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    Re: High MA Usage

    They say it sometimes takes close to a year for pH to settle in a plaster pool. Welcome to the club. Mine was put in last November and I'm adding roughly the same amount.
    18 x 36 Inground Gunnite, White Plaster 21K gallon
    18" raised spa, 8' Diameter (620 gallon)
    Triton II Sand filter, Intellichlor IC40 SWG
    Pentair Pump, Max-E-Therm 400 BTU
    Lamotte ColorQ PRO 7-Plus test kit
    TFT-100 test kit

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    JasonLion's Avatar
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    Re: High MA Usage

    There will be some PH increase due to the plaster continuing to cure for about a year after the plaster was originally applied.

    You will also be seeing some PH increase because of your TA level. Lowering your TA to around 60, or allowing it to come down to there on its own as you continue to use acid, will lower the amount of acid you need to use at least somewhat.
    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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    phalcon51's Avatar
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    Re: High MA Usage

    Ok,I guess I'll work on lowering the TA some more. i'm planning to add borates as well, up to 50 ppm. Will that help to stabilize the pH somewhat?
    26,200 gal. 35' x 16' Plaster IGP (50 yrs. old), Hayward 48 sq. ft. DE filter, Hayward EcoStar VS pump, Intellichlor IC-40 SWCG, The Pool Cleaner 4X suction, Pool Skim and Pool Devil skimmers. Re-plastered Sept. 2010.

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    JasonLion's Avatar
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    Re: High MA Usage

    Borates will cause the PH to change much more slowly, but they will not change the total amount of acid you need to use. You will be using more acid each time, less often.
    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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