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Thread: Drop in TA! And a Dumb Question!

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    hellstorm2004's Avatar
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    Drop in TA! And a Dumb Question!

    Hello Everyone,

    Today i tested the pool water. My TA has dropped to 70. Over the course of the year, this this is the first time TA has dropped below 90. I try to keep it around 100. What are the reasons for the drop in TA? Is it some sort of a warning sign? Or am i overthinking it and its normal?
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    Mod Squad tim5055's Avatar
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    Re: Drop in TA! And a Dumb Question!

    Do you add acid to keep pH in check? Continual acid additions will slowly reduce the TA.

    Now, why 100 for TA? Most of us find pH more stable with the TA a little lower. I keep mine in the 50 - 60 range.
    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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    Richard320's Avatar
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    Re: Drop in TA! And a Dumb Question!

    How much rain have you gotten since the last time you tested TA? Rainwater should have none. That will dilute the TA.

    Also, aeration caused by rain can cause pH to rise. When you lower pH with acid, you also lower TA. Check out Effects of Adding Chemicals at the bottom of poolmath. It will show you how much TA will drop when you add a certain amount of acid.
    16K freeform gunite with spa; Pentair 4000 DE filter; Century Whisperflow 1 HP; Pentair Minimax heater.
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    hellstorm2004's Avatar
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    Re: Drop in TA! And a Dumb Question!

    Well 90-120 was something that was written on the Taylor kit if remember it right. That's why i maintained it around 100. There was one ugly round of rain about 1.5 weeks ago, it lasted around a 2-3 hours, but did more damage than previous 9 months of heavy rain. Completely messed up my clean pool. Still running the pool robot to get it clean.
    Purex Titron FNS DE Filter 25000 gallons approx.
    Century A.O. Smith B855 56Y 2HP Motor. 40x25 (approx). Plaster surface.
    TFT-100 Test Kit.
    Rainbow Lifeguard 320.
    DX5+S Cleaner.

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