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Thread: high PH , low Alkalinity

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    Join Date
    Nov 2015
    arlington texas

    high PH , low Alkalinity

    pool size is 105k gallons. Ph is 8.2 and AK is 70. Chlorine is 4.0. Question is what is the proper way to balance, should I treat PH and see where AK goes or is there a better way?
    I have been asked to become the certified pool operator for the local Elks Lodge and I am new to pools. The pool is 105k gallons, in North Texas. Measures 75' x 40' x 24' depth is 11' to 5' It has an automatic clorinator, 1 pump for the skimmer and two pumps for main drain. I run all pumps for 8 hours a day. I plan to do this all winter. We must replaster the pool before we open in Spring and we are looking at Epoxy instead of plaster.

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    In the Industry

    duraleigh's Avatar
    Join Date
    Apr 2007
    Sebring, Florida

    Re: high PH , low Alkalinity

    Welcome to the forum.

    I would read "The ABC's of Pool Water Chemistry" up in Pool School. That'll give you some basic information on pool management.

    Your pH should be kept in the 7's always. I would lower pH with muriatic acid. The AK (I assume you mean TA........see definitions in Pool School) will also come down but you can adjust that back up with baking soda.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

  3. Back To Top    #3

    Join Date
    Sep 2013
    Charleston, SC

    Re: high PH , low Alkalinity

    Are there regulations about public pools in Arlington? You need to make sure you are following those before you deviate. Some municipalities have regulations particularly about CYA ppm and other levels.
    5900 G Fiberglass IG pool (circa 1990), SWG Hayward Aqua Rite GoldLine (2013), IntelliFlo Variable Speed Pump (2013), Hayward Pro Sand Filter (circa 1990), Well water (no iron or other metals fortunately), test with Taylor K2006C, Charleston, SC

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    Richard320's Avatar
    Join Date
    Jan 2010
    San Dimas, CA (LA County)

    Re: high PH , low Alkalinity

    Plug all your numbers into poolmath and set your target pH. It will give you a dose based on the pH and TA. Then scroll down to the bottom to Effects of Adding Chemicals. Input the dose of acid there. The pH reduction won;t be an exact match, but close, but the TA reduction has always been right on the money in my experience. That should give you a close approximation of what the new TA will be.

    Also be aware that if pH reads 8.2, there's a good chance it's actually higher than that, but you've reached the limits of the test kit.
    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.
    A pool is like a pet - you have to feed it every day, even the days you don't want to play with it!

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