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Thread: ta going down, ph going up

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    ta going down, ph going up

    hi all, i have a 3 week old plaster (wet edge) pool. my ta reading at fill time was 200 and the ph was above or at 8.2 (the highest on my kit...im waiting on a t-2006). i've been adding some acid to lower both. as of now, the ta has come down to 70. the ph will come a little, but then climbs back up to well over max. i understand the relationship with new plaster and rising ph, but what is the best approach? if i try to lower the ph more with acid, won't it just keep bringing the ta down as well? or at this point is it a waiting game until the plaster cures...thanks
    17,000 gal. in ground, poured Jan. '13
    Pentair 200 CC filter
    plaster finish - wet edge Antigua
    Pentair whisperflow 1.5 hp. 2 speed pump
    Pentair IC20 swg

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    JasonLion's Avatar
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    Re: ta going down, ph going up

    During the first three or four weeks after applying fresh plaster you need to focus on keeping the PH in range, which is 7.2 to 8.0. The PH can raise very rapidly and will typically require acid additions every day during the first month. After that things will slow down dramatically and you can focus on things like TA level.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
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    Re: ta going down, ph going up

    thanks jason, so i should focus on my ph level first, regardless of where the ta goes?
    17,000 gal. in ground, poured Jan. '13
    Pentair 200 CC filter
    plaster finish - wet edge Antigua
    Pentair whisperflow 1.5 hp. 2 speed pump
    Pentair IC20 swg

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    JasonLion's Avatar
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    Re: ta going down, ph going up

    Correct.
    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: ta going down, ph going up

    sorry, one more thing...how will i raise the ta without also raising the ph?
    17,000 gal. in ground, poured Jan. '13
    Pentair 200 CC filter
    plaster finish - wet edge Antigua
    Pentair whisperflow 1.5 hp. 2 speed pump
    Pentair IC20 swg

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    Mod Squad jblizzle's Avatar
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    Re: ta going down, ph going up

    Why do you need to raise the TA? You use baking soda and it has a minor effect on the pH.

    Posted from my Droid with Tapatalk ... sorry if my response is short
    Jason, TFP Moderator
    18k IG pebblesheen pool, Hayward ProLogic P4 w/ T-15 SWG, Pentair 1HP 2-speed Superflo, Hayward 6020 DE filter
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    Re: ta going down, ph going up

    cool...didn't know about not having a target ta, but will adjust ph and just let ta kind of do it's own thing according to the ph...it's just with a new pool, i didn't know which should take priority.
    17,000 gal. in ground, poured Jan. '13
    Pentair 200 CC filter
    plaster finish - wet edge Antigua
    Pentair whisperflow 1.5 hp. 2 speed pump
    Pentair IC20 swg

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