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Thread: Adjust PH or TA first?

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    Adjust PH or TA first?

    I need to raise my PH and my TA. I have an in-ground vinyl, and use BBB almost exclusively. Does it matter whether I put in the Borax or Baking Soda first? I think I've heard that TA should be adjusted first, is it possible that if I raise my TA, my PH will come up some also just from adding the Baking Soda?

    TA is 50, PH is 7.0. Usually my TA stays around 80 and PH around 7.6-7.8 without much adjustment, but we have had several inches of rain lately.
    Judy

    Designated "pool girl" for 18' x 40' in-ground vinyl pool built in 2006

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    duraleigh's Avatar
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    Re: Adjust PH or TA first?

    It's not terribly critical, but I think I'd adjust pH first. pH is the easiest to adjust.

    That way, if the pH drifts off target when you adjust your alk, it is quite simple to fine tune the pH at the end.
    Dave S. - Forum owner
    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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    Re: Adjust PH or TA first?

    Since neither one is dangerously off, you can adjust them in either order. Adding baking soda will raise the PH just a little, so you might want to do that one first.
    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: Adjust PH or TA first?

    Great, I'll add half the recommended amount of Borax first, retest for PH and TA, and then go from there. I may also cut on my deck jets to see if the aeration will bring it up some. I tend to overshoot when adjusting my PH, then have to go get muriatic acid.

    Thanks!
    Judy

    Designated "pool girl" for 18' x 40' in-ground vinyl pool built in 2006

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