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Thread: High ph

  1. Back To Top    #1

    Join Date
    Apr 2010
    Location
    Sunny Phoenix AZ
    Posts
    74

    High ph

    Hi guys,

    I drained my pool a few weeks back and ever since the ph has been out of control - I add muriatic acid to bring down to 7.2, and like 48 hours later, it's up around 8.2.

    My TA is 120 and I've read on here to try bringing it down around 60 and see if that helps.

    Here's my issue: I've been adding acid to keep the ph in check but the TA isn't going down with it, so presumably I need to add acid faster and aerate the heck out of it to get the ph up as fast as possible. But I don't want my pool to be rocking a 3.0 ph for any period of time either... so how low can i go on ph during this process without causing damage?
    28,000 gallons / Plaster / Hayward 30" Sand Filter / PoolCleaner 4x / PoolSkim / Hayward RS1500 / CircuPool RJ60

  2. Back To Top    #2

    Re: High ph

    How long ago was it plastered? dont go lower than 7.2 on ph to start. Plaster curing will elevate ph levels. Do you have any water features like a water fall or fountian. Do you have spa jets turned on that would be airating the water? This would cause the ph to rise as well, although like you said with the MA addition would lower TA. Rain or excessive water makeup? Have you added borates or other chemicals during this time? Posting a full set of readings would help determine water balance issues.
    coloeb,
    20k gal. IG fiberglass/plaster rectangle 32'x16'
    Hayward Superpump 3/4 H.P. primary Hayward model 5060 Booster Pump
    Hayward Pro Series High Rate Sand Filter
    Pentair Model 320 automatic Chlorine/bromine in-line feeder

  3. Back To Top    #3
    JasonLion's Avatar
    Join Date
    May 2007
    Location
    Silver Spring, MD
    Posts
    37,887

    Re: High ph

    As the TA level comes down, it will take longer for the PH to go up.

    Your TA is going down, just not quickly enough to show up obviously in the test. If you keep at it, you will get there. Adding more aeration can speed up the process, but isn't required.

    You can bring the PH down a little lower each time, targeting a PH of 7.0 is very reasonable once you are familiar with the whole process. Lowering PH further will speed everything up a little. If you do aim for a lower PH, you need to take extra care to be sure you don't add too much acid and overshoot.
    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

  4. Back To Top    #4

    Join Date
    Apr 2010
    Location
    Sunny Phoenix AZ
    Posts
    74

    Re: High ph

    Quote Originally Posted by coloeb
    How long ago was it plastered? dont go lower than 7.2 on ph to start. Plaster curing will elevate ph levels. Do you have any water features like a water fall or fountian. Do you have spa jets turned on that would be airating the water? This would cause the ph to rise as well, although like you said with the MA addition would lower TA. Rain or excessive water makeup? Have you added borates or other chemicals during this time? Posting a full set of readings would help determine water balance issues.
    It was plastered years ago. No features, I have aerators I can use but usually don't. I live in phoenix so it doesn't rain. No additional chemicals.

    I don't believe I have any water balance issues. As of this morning, TA=120, FC=5, CYA=50, CH=210, ph=8.2.
    28,000 gallons / Plaster / Hayward 30" Sand Filter / PoolCleaner 4x / PoolSkim / Hayward RS1500 / CircuPool RJ60

  5. Back To Top    #5

    Join Date
    Mar 2007
    Location
    San Rafael, CA USA
    Posts
    12,085

    Re: High ph

    Check the TA of the fill water. When there is evaporation and refill, whatever is in the fill water gets added to the pool, including TA and CH. You might need to do the TA lowering procedure to get the TA lower faster, but if your fill water is high in TA then that can be a challenge long-term.
    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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