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Thread: Cya and TA

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    Join Date
    Jul 2008
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    Seacoast, NH
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    248

    Cya and TA

    I know adding CYA will lower my pH. Will it also lower TA? The pool calculator doesnt mention effects on TA.
    19,000 gallons, Well Water
    Stay-Rite System 3 Cartridge filter
    IG vinyl, MasterTemp 400 Propane heater
    Intellichlor 40 SWG, 2006 Taylor Test Kit with Speed Stirrer
    1.5 HP Pump

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    coffeegoddss's Avatar
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    May 2012
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    Minooka, IL
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    Re: Cya and TA

    As far as I know, the only way to lower TA is to lower the pH and then let the pH go back up. Then you lower the pH again to lower the TA and let the pH rise again - it's a cycle. My TA is high and that's what I've been doing... I'll lower the pH to @7.2 and then turn the return jet upwards so the water breaks the surface. The aeration raises the pH without raising the TA like a lot of the additives to raise pH will. It's been slow going but it works.
    AG, 10,400 gallons, filter cartridge, 2HP pump
    Coffeegoddss...bonafide thread killer!
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    duraleigh's Avatar
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    Apr 2007
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    Re: Cya and TA

    To permanently lower TA, you must include aeration into the equation....in other words, manually accelerate the natural tendency to out-gas CO2 out of the water. So as Ms Coffee suggests, the CYA has virtually no affect.

    Perhaps even more important, do not overestimate just how much effect CYA has on pH. Use the poolcalculator to set up scenarios but you will find that adding normal amounts of CYA to your pool will not have any really drastic affect on your pH.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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    JasonLion's Avatar
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    May 2007
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    Re: Cya and TA

    The net effect of adding CYA is normally a small increase in TA.
    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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