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Thread: Can TA be too high?

  1. Back To Top    #1

    Join Date
    Apr 2010
    Southern California

    Can TA be too high?

    The recommended level in pool school for my type of pool is 70-90+

    In my case, it is currently about 120, and was closer to 150 several days ago. Is there a point where it is considered too high?

    Current levels:
    FC: 5
    CYA: 40
    pH: 7.4
    TA: 120

    (don't know CH at this time)
    12,000 gallon IG (newly re-plastered) pool, Pentair 3/4hp pump, DE filter, TF-100 test kit

  2. Back To Top    #2
    JasonLion's Avatar
    Join Date
    May 2007
    Silver Spring, MD

    Re: Can TA be too high?

    How high you can let TA go depends on a number of other factors. The most important one for a plaster pool is balancing TA and CH levels. If TA is high you don't want CH to also be high at the same time. If you are in the situation where both TA and CH are high, since TA is easier to lower than CH, you need to set an upper bound on your TA level, rather than lowering your CH level.
    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

  3. Back To Top    #3
    Richard320's Avatar
    Join Date
    Jan 2010
    San Dimas, CA (LA County)

    Re: Can TA be too high?

    Yes, there is a point where it's too high - when CSI starts going positive. Plug your test numbers - including water temperature - into Pool Calculator and see what CSI is.

    The water here in SoCal is hard, so I can assure you CH and TA are going to be high. Test the water coming out of the hose next time you add water, just so you know what it is. If the tap water is 300 CH, there's no point shooting for 250.

    Then punch numbers into the target zone of Pool Calculator to see how to get CSI down. CH is going to climb through evaporation and refill. Temperature is going to climb and there's not much you can do with that. Which leaves you with TA and pH to adjust. So buy a couple gallons of acid. It will get used up.
    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.
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