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Thread: Adjust pH or TA first?

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    Join Date
    May 2008
    Location
    central Florida
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    27

    Adjust pH or TA first?

    If I’m at the upper limit on pH and the lower limit on TA which should I address first? Or does it matter? My pH is currently 7.8 and TA is 70. I know each affects the other, but is it more advisable to lower pH first by adding acid or should I raise TA first by adding baking soda? I entered my numbers into the Pool Calculator and understand the amounts I need to add as a starting point, but was just wondering about the order.
    12K gal PebbleTec, 1.5 HP 1-spd P2RA series Sta-Rite pump, Hayward cart filter, Pool Pilot SWG, spillway, no heater, sunny, Taylor K-2006 test kit.

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    In the Industry

    Join Date
    Mar 2007
    Location
    Knippa, Texas
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    289
    Adjust the pH first, then wait at least a couple of hours to adjust TA.

    If you adjust the TA first, it will take more acid to lower the pH.
    ~Jules~

    My pool: INDOOR 13x27 rectangular fiberglass, built ~2001, BBB, TA-60 sand filter, Hayward two speed pump (1 hp/0.33 hp), 3/4 hp booster pump for solar heater
    Taylor K-2006 test

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    Guest
    IF you are using liquid chlorine or bleach then just lower your pH to 7.6. Your TA should be fine where it is.

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    Join Date
    May 2008
    Location
    central Florida
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    27
    Quote Originally Posted by waterbear
    IF you are using liquid chlorine or bleach then just lower your pH to 7.6. Your TA should be fine where it is.
    yeh, that's what I typically do (I use liquid Cl). I'll add a little acid and the TA number doesn't really move much. my pool likes to hover around a TA of 70. I was just curious if I go on vacation say, then come back and my pH is 8 and TA is below 70 --what order do I attack it. in my limited experience I have always adjusted the pH first (since it seems to be much more sensitive), then the next day take a pH and TA reading and adjust TA if necessary.
    12K gal PebbleTec, 1.5 HP 1-spd P2RA series Sta-Rite pump, Hayward cart filter, Pool Pilot SWG, spillway, no heater, sunny, Taylor K-2006 test kit.

  5. Back To Top    #5
    Guest
    I would adjust the pH first. In the case you describe it is very unlikely that the pH would rise and the TA fall. Adding acid causes the TA to fall so if there is no acid added then it should be stable. If you use trichlor while on vacation a more likely scenerio would be both the pH and TA falling because of the acidic nature of trichlor.

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