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Thread: A pH miracle

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    A pH miracle

    After draining and acid washing for extensive calcium staining back in February, I have battled rapid hikes in pH...about .2-.3 per day. Asked for advice everywhere I could and nothing really seemed to help. Fast forward-my last acid addition was 6 days ago. I took it down to 7 to also lower my TA (which is now roughly 65) and for the past 3 days, it has remained at 7.5!

    Q-is it possible that the residual calcium from the acid wash continued dissolving, thus increasing my pH? Does anyone have experience with this? I'm praying the problem doesn't return!

    Thanks for the feedback!
    10 x 26 IG gunite/plaster
    7300 Gallons
    Hayward Tristar single speed 1 HP
    Hayward CF C4025
    Pool DOB 1/10

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    JasonLion's Avatar
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    May 2007
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    Silver Spring, MD
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    Re: A pH miracle

    When you acid wash, whatever is going to happen happens right away. There wouldn't be any delayed effects.

    There isn't quite enough information here to be sure, but most likely you were experiencing PH drift because your TA was too high.
    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

    Re: A pH miracle

    I was afraid I was going to hear that Jason.
    My TA has been in this range since March, so its not that either. I haven't changed anything. Maybe the TA of my auto-fill suddenly decreased, think I'll check that.
    10 x 26 IG gunite/plaster
    7300 Gallons
    Hayward Tristar single speed 1 HP
    Hayward CF C4025
    Pool DOB 1/10

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    Join Date
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    San Rafael, CA USA
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    Re: A pH miracle

    Maybe there has been a change in wind? There's less carbon dioxide outgassing on a still air day.
    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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    Re: A pH miracle

    No miracle, it was just the more rapid dissolving of the trichloro pucks as the water continued to warm under the desert sun. Back to the drawing board
    10 x 26 IG gunite/plaster
    7300 Gallons
    Hayward Tristar single speed 1 HP
    Hayward CF C4025
    Pool DOB 1/10

  6. Back To Top    #6

    Join Date
    Mar 2007
    Location
    San Rafael, CA USA
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    12,082

    Re: A pH miracle

    Thanks for letting us know. I didn't know you were using Trichlor. That's like adding both chlorine and acid (and CYA, of course) so would help keep the pH lower. And yes, if it were to dissolve faster then that is like adding more acid to the pool. The lower TA which you write is now 65 ppm would also help counter the rate of rise from carbon dioxide outgassing.
    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"

  7. Back To Top    #7

    Re: A pH miracle

    Yes, I had been using it for months, but even with it the pH still rises. Guess it was just freak conditions that accelerated the pace of dissolve. My CYA also jumped and this is why I took it out, but two weeks later I have learned pucks are the only way to survive in the desert if one is not available to do daily additions.
    10 x 26 IG gunite/plaster
    7300 Gallons
    Hayward Tristar single speed 1 HP
    Hayward CF C4025
    Pool DOB 1/10

  8. Back To Top    #8
    linen's Avatar
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    Jul 2010
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    Twin Cities, MN
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    Re: A pH miracle

    Quote Originally Posted by palmspriings
    but two weeks later I have learned pucks are the only way to survive in the desert if one is not available to do daily additions.
    This is not true. SWGs and liquid chlorine pumps are very viable options used by many arid/hot climate pool owners. Pucks on the other had will be a recipe for drain/refills.
    TFP Expert who uses Pool School and my TF100 test kit along with PoolMath for my: Round 11K gallon AGP with deep end, 20" sand filter, Matrix 1hp 2spd, 6 2ftX20ft solar panels (and solar cover!), Intex SWCG (copper bars disconnected) and a Rubadub hot tub (chlorine). The SLAM process is not finished until: 1. CC < 0.5 ppm, 2. An OCLT < 1.0 ppm and, 3. The water is crystal clear.

  9. Back To Top    #9

    Re: A pH miracle

    True enough Linen, however the CH requires frequent partial drains anyway. I would love to go salt, maybe down the road
    10 x 26 IG gunite/plaster
    7300 Gallons
    Hayward Tristar single speed 1 HP
    Hayward CF C4025
    Pool DOB 1/10

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