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Thread: question about TA and pH

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    terriolsen's Avatar
    Join Date
    Jun 2007
    Huntington Beach, CA

    question about TA and pH

    I had my pool replastered in August 2010.

    It has been recommended that I keep my pH between 7.2 to 7.4 in order to avoid white-stuff in my liquidator. To do this, I'm checking my pH every other day and adding between 6 oz to 22 oz (if I missed a day) of acid. So I'm adding acid all the time.... How long before I won't need to keep adding so much acid? I have no water features, no SWG, just plaster that eventually (when?) will stabilize.

    I wonder if my frequent acid dosage is what keeps my TA so low. The TA seems to want to be around 80. I keep bumping it up to 100 with baking soda, and then a week or two later, its back to 80. Why is this?

    My numbers are:
    FC 4.5
    CC 0
    TC 4.5
    pH 7.4
    TA 80
    CH 400
    CYA 30

    10,000 gallon Pebble Fina Grigio, Pentair FNS Plus 60 sq ft DE filter, WhisperFlo Dual Speed 3/4 HP pump, IntelliBrite LED Light, The PoolCleaner, 8 gal Liquidator

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    Mod Squad woodyp's Avatar
    Join Date
    Apr 2010
    East Texas

    Re: question about TA and pH

    Dosing it with muriatic acid to knock the PH down also knocks down the TA.
    16x32x52" Steel Cornelius Miramar AGP Vinyl liner 13,100 gal. Buried 2 ft.
    2 Speed Hayward Power-Flo Matrix 85 g.p.m. 22" 250lb. sand filter hard plumbed
    Pool Rover Jr., Pool Blaster Max, Diver Dave TF100 Test Kit/Speed Stir
    Margaritaville Frozen Concoction Maker, Liqour Chiller, & Drink Mixer & Party Tub----Collect 'um all!

  3. Back To Top    #3

    Join Date
    Mar 2007
    San Rafael, CA USA

    Re: question about TA and pH

    Stop bumping up the TA to 100. Let it drop even to 60. That will lessen the amount of acid you are adding and will reduce the white stuff problem. In fact, with a low enough TA, you won't have to have the pH be quite as low since it's the saturation index that determines the amount of white stuff, not the pH alone. Finally, you might consider using 50 ppm Borates which can also help prevent the white stuff in The Liquidator.
    16,000 gallon outdoor in-ground 16'x32' plaster pool; Pentair Intelliflo VF pump; Pentair IntelliTouch i9+3s control system; Jandy CL-340 square foot cartridge filter
    12 Fafco solar panels; Purex Triton PowerMax 250 natural gas heater (200,000 BTU/hr output); automatic electric pool safety cover; 4-wheel pressure-side "The Pool Cleaner"

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