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Thread: pH is high after SPA heating cycle

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    pH is high after SPA heating cycle

    Hello All,
    Thanks in advance for you help. I've just started up my SPA and trying to balance pH and TA before I pour in the start up bromine and stuff. I got the TA and pH to desired level but pH is high after SPA heating cycle. I've set my SPA to heat (slow speed) between 9PM and 6AM, and when I check the following day, pH is really red. TA is at same level. Why is pH doing this? I know about the aerate increasing pH but none of the jets are above the water line. I use acid to lower pH to 7.2, but it goes high again after SPA heating cycle. TA is good. I can't keep adding acid everyday because acid will also lower TA and then I need to add baking soda to raise TA and it's just a infinite loop. Please help. Thank you.
    16k gal, IG pebble tech,DE #, 1/2HP

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    JasonLion's Avatar
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    Re: pH is high after SPA heating cycle

    Welcome to TFP!

    What is your TA? Assuming this is a stand alone spa, you TA is probably too high. The ideal TA for a stand alone spa is the highest TA where what you describe does not happen.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
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    Re: pH is high after SPA heating cycle

    Quote Originally Posted by JasonLion View Post
    Welcome to TFP!

    What is your TA? Assuming this is a stand alone spa, you TA is probably too high. The ideal TA for a stand alone spa is the highest TA where what you describe does not happen.
    TA is 80. This is above ground SPA, I filled it about 360 gallons. As I remember, Taylor test kit recommends TA range from 80-140
    16k gal, IG pebble tech,DE #, 1/2HP

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    Re: pH is high after SPA heating cycle

    A TA in the 80 to 140 range is too high for a spa. Try 60 ppm or even slightly lower if necessary. Also try keeping the pH at about 7.8.

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    Richard320's Avatar
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    Re: pH is high after SPA heating cycle

    Quote Originally Posted by ithelpme View Post
    TA is 80. This is above ground SPA, I filled it about 360 gallons. As I remember, Taylor test kit recommends TA range from 80-140
    Play with poolmath a little. See how lower TA decreases the acid demand to effect a certain pH change. And then on a practical note: adjust pH. Keep adjusting it. You will notice over a few weeks that as TA drops, acid demand drops, and pH remains in range for longer periods of time. That's the sweet spot. Who cares if it's 65 or 100; every pool/spa has a unique personality. If pH holds steady at a certain TA, that's where you want it.
    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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