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Thread: CYA drops Ph--is this normal?

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    CYA drops Ph--is this normal?

    Put 3 lbs. wallyworld (Aquachem) CYA in yesterday via sock hung from ladder. Almost all disolved in 24 hours (may have 2 oz. still in sock) and my Ph went from approx 7.7 to 7.2/7.1 in that time. Is this kind of drop normal/expected?
    Don't think it's a problem.....just surprised how fast it disolved and the swing on Ph that wide.
    As always, thanks for all the help!!
    16,000 IG, SWG, 175 sq. ft. cartridge, 1.5 hp pump, vinyl, Charlotte NC
    TF-100, Pool School, Pool-Calc

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    Butterfly's Avatar
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    Re: CYA drops Ph--is this normal?

    CYA is acidic and will lower pH. To learn how much, go to the PoolCalculator.com. Look near the bottom for "Effects of Adding Chemicals" and do the calcs with your pool's volume.
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    Richard320's Avatar
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    Re: CYA drops Ph--is this normal?

    Pool Calculator says 3 lbs of stabilizer will raise CYA by 22 and lower pH by .42

    (It's down near the bottom where it says "effects of adding chemicals")
    16K freeform gunite with spa; Pentair 4000 DE filter; Century Whisperflow 1 HP; Pentair Minimax heater.
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    Re: CYA drops Ph--is this normal?

    Yes, that is normal.
    18x36 Vinyl In-ground w/roman ends 27,400G, Hayward 3/4hp with 300# sand filter. Hayward heat pump heater

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    Re: CYA drops Ph--is this normal?

    Thanks Butterfly!! Duh...I keep finding out more that the pool-calc will do every time. Looks like it did EXACTLY what is expected.
    THANKS!!!!!!!
    16,000 IG, SWG, 175 sq. ft. cartridge, 1.5 hp pump, vinyl, Charlotte NC
    TF-100, Pool School, Pool-Calc

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    Butterfly's Avatar
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    Re: CYA drops Ph--is this normal?

    Quote Originally Posted by samiguy
    Thanks Butterfly!! Duh...I keep finding out more that the pool-calc will do every time. Looks like it did EXACTLY what is expected.
    THANKS!!!!!!!
    you're welcome, and yes, the PoolCalculator rocks! Did you happen to notice that THREE of us responded to your post almost at the exact same time! dang, TFP is the Bomb!
    TFP Moderator TF100 Test Kit TF100 TestKit YouTube Channel PoolMath
    You're done SLAMing when:
    1)You lose 1ppm or less FC overnight, & 2)You have .5ppm CC's or less, & 3)your water is clear.

    ~ One should not use a sledge hammer to swat a mosquito. ~

    If you found TFP helpful and we saved you money ... Become a TFP Supporter!

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    Re: CYA drops Ph--is this normal?

    OH YEAH!!! You guys had an answer before I could even say THANK YOU!! This place ROCKS!! Best my pool has ever looked and my wallet is way fatter!! I can't say enough good things about you guys and the wonderful results!!
    Again, MANY THANKS!!!!!
    16,000 IG, SWG, 175 sq. ft. cartridge, 1.5 hp pump, vinyl, Charlotte NC
    TF-100, Pool School, Pool-Calc

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