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Thread: New Plaster Testing - PH high but TA is good

  1. Back To Top    #1

    Join Date
    Nov 2014
    Palm Desert, CA

    New Plaster Testing - PH high but TA is good

    It's been almost one month since our new replaster and every time I test the PH it is high (over an 8 using a Tayor K-2006 test kit). Usually the TA is in the acceptable range of about 80ppm. I'm assuming it is ok to add muriatic acid to lower the PH even though the TA is in the acceptable range? I know everyone says they need to add acid to a new plaster for an extended period of time but it seems I'm doing it almost every day. Is this normal?

    Yesterday's test:
    PH - over an 8 (took 3 drops of R005 to bring it down).
    TA - 90ppm.
    CH - 210ppm.

    Today's test:
    PH - over an 8 (took 1 drop of R005 to bring it down).
    TA - 80ppm.

    We have a SWG which is showing salt level at 1900 so we need to add more salt. We are also in a hard water area so I'm hesitant to raise the CH even though Pool School says for a SWG to try for it between 250-350ppm. Anything you see in these numbers that says I should be doing something different? THANKS!
    17,000 gallon inground pool; Plaster redone January 2015; Pentair Cartridge Filter; SWG; Age of pool unknown (house built in 1973); Taylor K-2006 Test Kit.

  2. Back To Top    #2
    pwrstrk's Avatar
    Join Date
    Aug 2012
    Elverson Pa.

    New Plaster Testing - PH high but TA is good

    What your experiencing is totally normal. When your PH gets to 8 lower it down some. Try lowering it to 7.6-7.8. Sometimes if you lower it to low it will rise faster.
    Your TA of 80 is a little higher than what is recommended for a SWG. It should be about 60, and that will also help slow your PH drifting up. Now when you lower your PH with acid that will slowly lower your TA also. If your TA drops below 50 from lowering your PH just bring the TA back up with baking soda.
    It may be a juggling act until things calm down from the plaster curing process.
    24'x54" AG Morada RTR (by wilbar) 13'500 gal. Hayward Powerflo Matrix 1hp 2 speed. Hayward Perflex EC65 DE filter.

  3. Back To Top    #3
    Divin Dave's Avatar
    Join Date
    Oct 2013
    Longview, Texas

    Re: New Plaster Testing - PH high but TA is good

    Just to reinforce what pwrstrk says, its completely normal.

    You do need to keep the pH down though, if you dont, it could potentially lead to calcium scaling if all of the wrong conditions fall into place. That would be a shame.
    Divin Dave,
    IG Vinyl, 15' x 30', 3 1/2' - 6' deep, Oval, ~15K gal, Intelliclor IC40, Intelliflo VS pump, Clean and Clear 420 Filter, auto-fill-disabled, Retrofit LED Color Light, Dolphin Nautilus Robot, TF100 Test Kit, Taylor K1766 Salt Test Kit, Tftestkit Pressure Gauge. Experience- it's what's learned just after you needed it most !!

  4. Back To Top    #4
    BoDarville's Avatar
    Join Date
    Jun 2012
    DFW, Texas

    Re: New Plaster Testing - PH high but TA is good


    You've received great advice from two of our finest on this issue and would encourage taking their suggestions to heart.
    Gold Supporter, TFP Lifetime Supporter, 26,680 gal Plaster IGP 3.5 - 10' depth / Attached Waterfall Spa, Manually Chlorinated, Triton Sand Filter, 1.5 HP * 1.1 SF = 1.65 SFHP 1-speed Pentair WhisperFlo WF-26 Pump, 400K BTU NG Teledyne Laars Series One Heater, Polaris 360, Test Kit Comparison, Chlorine/CYA Chart, SLAMing Your Pool, OCLT
    A good test kit is an investment, not an expense.

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