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Thread: Numbers didn't move like they should have -- help...

  1. Back To Top    #1

    Join Date
    Aug 2015
    Teutpolis, IL

    Numbers didn't move like they should have -- help...

    So last night numbers were

    CYA - 50
    TA - 140
    PH 8.2 plus

    The highest the PH measure goes up is 8.2 but looked about like the right shade.
    We added chlorine and muratic acid. We put in the muratic acid based pool math to bring ph down to 7.2 and bring TA down a little bit.

    Today the numbers ph still 8.2 or higher. TA went up to 220!!!
    Why did the TA jump and what do I do?
    18x33x4 oval Above ground pool- 15300 gallons, sand filter, full sun no shade
    tft-100 test kit
    Central Illinois

  2. Back To Top    #2
    Mod Squad Texas Splash's Avatar
    Join Date
    Jun 2014
    South-Central Texas, Marion/San Antonio

    Re: Numbers didn't move like they should have -- help...

    There has to be a testing discrepancy somewhere. TA won't just rise that much on its own. Let's confirm a couple things:
    - TA tested with 25ML sample, 2 drops of #7, 5 drops of #8 (green), then drops of #9 until it turns Barbie pink correct? Multiply by 10?
    - pH in the comparator view; 5 drops of red reagent?

    The Poolmath calculator is pretty good about showing what you need when you enter the current (NOW) and projected (TARGET) numbers. Maybe you can clarify some more what happened or if any testing errors might be possible?
    Pat (a.k.a. Texas Splash) ~ My Pool: Viking Fiberglass; 17,888 Gal; Waterway Supreme 2-sp/2-hp pump; Hayward Ctg filter; TF-100 w/ Speed Stir
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  3. Back To Top    #3
    Mod Squad
    Join Date
    Aug 2012
    DFW, TX

    Re: Numbers didn't move like they should have -- help...

    TA only goes up if you add baking soda, borax, washing soda or higher TA fill water. The only other option is testing error.

    More on pool chems here, Pool School - Recommended Pool Chemicals

    Be sure to follow the TA test process completely, it is prone to errors if not, Pool School - Extended Test Kit Directions
    TFP Moderator
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