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Thread: Aeration and TA??

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    Aeration and TA??

    Hi, I've read the forum and pool school for information for some time, but I have an issue that's confusing me so here's my first post/question. I'm in El Paso, TX and opening up early so I can take advantage of the solar cover to have the pool warm enough for use by March 25 or so.
    After getting it cleared up my numbers were: Cl 4ppm; pH 7.5; TA 170; CH 450. The pool is 20k gallons with 1.5hp Hayward Super II and S244T Pro Series sand filter.

    To treat this I drained 2 feet from the pool and after refilling my numbers were TA 160 and CH 330 so I added 50 oz. HCl to lower the ph to 7.0 and began aerating. My pool is equipped with 4 fountain spouts so aerating is fairly easy. After 36 hours the pH came up to 7.5 again and the TA is now 110 (hooray for me).

    The reason for my question is that I have continued aerating during the daily cycle of 6.5 hours for 3 days now and the pH is still on 7.5. I had hoped to let it get up near 7.8 and add more acid to 7.5 just to see what it would do to the TA. I'm confused about the pH staying at 7.5. Is there a component that I'm overlooking that would cause the pool to act like it's buffered? I'm open to any suggestions.

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    Re: Aeration and TA??

    Chlorine tabs are acidic. If you're using them, that could offset ph rise from aeration.

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    JasonLion's Avatar
    Join Date
    May 2007
    Silver Spring, MD

    Re: Aeration and TA??

    Welcome to TFP!

    If you are trying to lower TA quickly, it is more effective to lower the PH to around 7.2, instead of 7.5. PH increase will be faster at lower PH.

    The lowering TA process can take quite a while, and it slows down significantly as the TA goes down.
    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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    Richard320's Avatar
    Join Date
    Jan 2010
    San Dimas, CA (LA County)

    Re: Aeration and TA??


    You wouldn't happen to know what your CYA level is, would you? Because if it's way high, you might not have drained enough water, and all this careful balancing could be for nothing if you have to drain more later on.
    16K freeform gunite with spa; Pentair 4000 DE filter; Century Whisperflow 1 HP; Pentair Minimax heater.
    Troublefree does not mean Maintenancefree. It's like brushing your teeth: You can spend a couple minutes a day and pennies a week or go to the dentist once a year and spend several thousand dollars.
    A pool is like a pet - you have to feed it every day, even the days you don't want to play with it!

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