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Thread: ph vs TA My Battle

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    ph vs TA My Battle

    My TA was hovering around 60 all summer long. After woring all fall to bring it up I have it and the pool stable at TA of 90 and ph of 7.8. Its held this for a month without any additions of baking soda or MA.

    Should I just leave it here or try and get the TA up to 100 and the ph down to 7.5?

    This morning

    FC 5
    CC 0.5
    TA 90
    PH 7.8

    CYA less than 25

    Ch 660

    Right now I get a CSI of .35. If I reduce to 7.5 it makes a clear difference but I can't get it to hold there and my TA jumps around
    22k gallon IG pebblefina, Jandy 1.5 HP VS, Jandy CV Cartridge filter, Fafco solar panels, Polaris 360 supply side cleaner, waterfall

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    Re: ph vs TA My Battle

    Curious, if you had no problems with a TA at 60 for the duration of the summer, why do you want it higher than 90 now? Ph rise a lot less with a lower Alk.
    Doughboy 12' x 20' Saphire semi-AG, Installed 2012
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    Re: ph vs TA My Battle

    Because the TFP guidelines call for a higher TA.
    22k gallon IG pebblefina, Jandy 1.5 HP VS, Jandy CV Cartridge filter, Fafco solar panels, Polaris 360 supply side cleaner, waterfall

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    Re: ph vs TA My Battle

    Disregard what is called for as that is not necessarily correct. Raising your TA and lowering your pH is a recipe for an endless roller coaster of acid and baking soda additions.

    Raising your TA is only going to cause your pH to rise higher and faster and high TA with low pH only further increases pH rise. A TA around 60 is ideal in my opinion since the pH will rise very slowly and that coupled with a pH of 7.8 is fairly close to being at equilibrium for the carbon dioxide content of the water and air (outgassing being the major contributor to pH rise) .

    Are you finding your TA dropping? How are you chlorinating? Why is your CYA so low?

    How is your TA jumping around? That isn't really possible unless you are influencing it somehow.
    -Brian-
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    Re: ph vs TA My Battle

    Your pool has shown you it's "happy place". Listen to your pool and let it ride.

    Kim
    TFP Moderator 33x52 round AG 25,600 gals Sand Filter 1.5hp Pump - 2 Speed, SLAM, Pool School, Recommended Levels, Recommended Chemicals, Pool Math, Chlorine/CYA Chart, TF-100 Test Kit

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    Re: ph vs TA My Battle

    Agreed, TA at 60-70 is fine if PH is stable. TA only needs to be raised if PH is erratic.
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    Re: ph vs TA My Battle

    The attempt to precisely define TA levels for all situations doesn't seem to work well. As Kim says, your pool is stable and happy.....leave it alone.

    CSI and the numbers we suggest are pretty solid indicators but the stability of your pool water is the best indicator of all.

    Hi-jacking just a bit......Why is your CYA so low?
    Dave S.
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    Re: ph vs TA My Battle

    Rain and overflow drops it some. Also my CYA tends to drop during the winter.
    22k gallon IG pebblefina, Jandy 1.5 HP VS, Jandy CV Cartridge filter, Fafco solar panels, Polaris 360 supply side cleaner, waterfall

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    Re: ph vs TA My Battle

    As others have said, listen to your pool. My pool really like my TA in the 40 - 50 range. If I go above 60 I'm adding acid every day to keep the pH in check.
    TFP Moderator 39 X 18 23,000(ish) freeform gunite; built 2007ish; Pentair Triton II TR100 600lb Sand filter; 2 HP Pentair pump with 2.2 HP AO Smith single speed motor; 2 skimmers, 1 main drain, 4 returns w/waterfall, Stenner 45MHP2 3GPD running@ 60% - 15 gal Tank; heated by the sun CYA 200+ when I started - 50 now. Dolphin Supreme M5 Pool Cleaner. Hot Springs SX Spa, 285 gallon

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    Re: ph vs TA My Battle

    Quote Originally Posted by tim5055 View Post
    As others have said, listen to your pool. My pool really like my TA in the 40 - 50 range. If I go above 60 I'm adding acid every day to keep the pH in check.
    Ditto, and my high calcium not only makes me need it here, it allows it to work for me. Situations are not the same for all users.
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    Re: ph vs TA My Battle

    Quote Originally Posted by tim5055 View Post
    As others have said, listen to your pool. My pool really like my TA in the 40 - 50 range. If I go above 60 I'm adding acid every day to keep the pH in check.
    How are you able to maintain a TA in the 40's? I imagine you'd have to use borates for stability, but a TA of 40 with just about any other numbers makes the CSI VERY negative.
    -Brian-
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    Re: ph vs TA My Battle

    If it ain't broke, don't fix it.
    Divin Dave,
    IG Vinyl, 15' x 30', 3 1/2' - 6' deep, Oval, ~15K gal, Intelliclor IC40, Intelliflo VS pump, Clean and Clear 420 Filter, auto-fill-disabled, Retrofit LED Color Light, Dolphin Nautilus Robot, TF100 Test Kit, Taylor K1766 Salt Test Kit, Tftestkit Pressure Gauge.
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    Re: ph vs TA My Battle

    Quote Originally Posted by bdavis466 View Post
    How are you able to maintain a TA in the 40's? I imagine you'd have to use borates for stability, but a TA of 40 with just about any other numbers makes the CSI VERY negative.
    No borates. With a dog and five cats that think it's a big water bowl I won;t take the chance.

    I keep the pH at the upper end of the scale and my CSI is around -.3 As the water warms up the CSI moves closer to "0"
    TFP Moderator 39 X 18 23,000(ish) freeform gunite; built 2007ish; Pentair Triton II TR100 600lb Sand filter; 2 HP Pentair pump with 2.2 HP AO Smith single speed motor; 2 skimmers, 1 main drain, 4 returns w/waterfall, Stenner 45MHP2 3GPD running@ 60% - 15 gal Tank; heated by the sun CYA 200+ when I started - 50 now. Dolphin Supreme M5 Pool Cleaner. Hot Springs SX Spa, 285 gallon

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