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Thread: High PH

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    pitguy3's Avatar
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    High PH

    I have read How do I use Chlorine in my Spa (or pool) but I have a question... My pH is over 8. My HT is 410 gallons. Per the Pool Calculator, I am told to add 1 oz and 5 teaspoons of Muriatic acid to bring it to 7.0. I have been running it like the instructions stated for 30 minutes and it is still over 8. Do I continue adding acid unit it drops? How long should I wait between doses? Sorry for all the questions, but I really don't want to screw this up...
    Intex 20x52 above ground pool-
    10600 gallons
    1 man 4 woman Bullfrog Hot Tub
    http://www.flickr.com/photos/pitguy3/se ... 763801706/
    ROLL TIDE!

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    Mod Squad pooldv's Avatar
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    Re: High PH

    Yes, your pH must have been well above 8.0. That is the highest the test reads, but it could be a lot higher. Add acid, pump running and retest in 15 or 20 minutes. Repeat until the pH comes in to range on the test.
    TFP Moderator
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    pitguy3's Avatar
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    Re: High PH

    Thanks pooldv... It's a fresh fill and a CYA only add so I'm not sure what the deal is/was...
    Intex 20x52 above ground pool-
    10600 gallons
    1 man 4 woman Bullfrog Hot Tub
    http://www.flickr.com/photos/pitguy3/se ... 763801706/
    ROLL TIDE!

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    JoyfulNoise's Avatar
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    Re: High PH

    What's your TA? If your TA is high, your pH will go up like crazy in a hot, highly aerated tub.
    Matt
    16k IG PebbleTec pool, 650gal spa, spillway and waterfall, 3HP IntelliFlo VS / 1.5HP WhisperFlo, Pentair QuadDE-100 filter, IC40 SWCG, MasterTemp 400k BTU/hr NG heater, KreepyKrauly suction-side cleaner Dolphin S300i robot, EasyTouch controls, city water, K-1001, K-2006 and K-1766 test kits, Mannitol test for borates

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    pitguy3's Avatar
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    Re: High PH

    TA was at 110...
    Intex 20x52 above ground pool-
    10600 gallons
    1 man 4 woman Bullfrog Hot Tub
    http://www.flickr.com/photos/pitguy3/se ... 763801706/
    ROLL TIDE!

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    JoyfulNoise's Avatar
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    High PH

    That's way too high for a hot tub. The aeration and outgassing of CO2 at that TA level is very high and causes pH to increase rapidly.

    TFP recommends that hot tub owners reduce the TA to 50ppm and add 50ppm borates to the water. That drastically reduces the pH rise as the lower TA means less aqueous CO2 is generated and the borates act as a buffer against rising pH.
    Matt
    16k IG PebbleTec pool, 650gal spa, spillway and waterfall, 3HP IntelliFlo VS / 1.5HP WhisperFlo, Pentair QuadDE-100 filter, IC40 SWCG, MasterTemp 400k BTU/hr NG heater, KreepyKrauly suction-side cleaner Dolphin S300i robot, EasyTouch controls, city water, K-1001, K-2006 and K-1766 test kits, Mannitol test for borates

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    pitguy3's Avatar
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    Re: High PH

    It's all under control now with pooldv's help!! pH is now at 7.2 and TA is a 55...
    Intex 20x52 above ground pool-
    10600 gallons
    1 man 4 woman Bullfrog Hot Tub
    http://www.flickr.com/photos/pitguy3/se ... 763801706/
    ROLL TIDE!

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    Mod Squad pooldv's Avatar
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    Re: High PH

    Whoot!
    TFP Moderator
    If TFP helped you or saved you money - Become a TFP Supporter! <--Click here
    2012 build and pics, 20k gal gunite, black onyx pebblesheen, OK flagstone, IntellifoVS, cart filter w/Pleatco, IC40 SWG, Solartouch, 5 12'x4' solar panels, HP50HA heat pump, 8mil solar cover, borates, TF-100 test kit, SONOS, Doheny's Discovery Robot, hot tub on bleach

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