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Thread: Am I on the right track

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    Join Date
    May 2011
    Location
    Stockton, CA
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    Am I on the right track

    Hello TFP!

    My pool is 14'x23' 7,500gal IG and is very swampy dark green! Using a taylor kit (I'm waiting on a better chlorine tester to ship ) my values are:

    CYA: 80
    TA: 110
    CH: 0 (it never turned red)
    PH: 14 (it was way brighter then the max reading of 8.2)
    and 0 Chlorine of any sort!

    My first step was going to be drain pool halfway (to lower CYA to 40) and get as much debris out as possible. Next I was planning filling back up, raising chlorine to shocking level and continuing to remove debris while I run the pump. Am I on the right track? I know My TA is a bit high but I figured the values will all change once I lower the CYA and start getting some chlorine in the water.
    7,500 Gallon Pentair CC150 Cartridge Filter Plaster

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    Mod Squad zea3's Avatar
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    Jul 2009
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    Houston, Texas
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    9,201

    Re: Am I on the right track

    Hi, welcome to TFP!
    Don't worry about the TA at this point, it probably will change before you are finished with the shock process.

    The first thing you need to do is retest the pH! If it is really that high then use The Pool Calculator to find out how much Muriatic acid you will need to lower the pH to 7.2 . Use 8.2 for your starting number. Repeat the process until the pH measures between 7.2 to 7.5.

    CYA of 80 is a little high. If you are dropping it just for shocking the pool then you should only need to drain about 1/4 of the pool's volume.

    Double check the CH results. Be sure to swirl the tube about a minute between each drop so that it mixes well. If you still get very low results have it tested at the pool store, just don't buy anything from them and post the result here.

    Be sure you recheck and adjust the pH first. High pH and low CH can lead to significant damage to the plaster finish.
    TFP Moderator
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    Join Date
    May 2011
    Location
    Stockton, CA
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    Re: Am I on the right track

    I tested again and waited and stirred between each drop. Towards the last 4/5 drops or so it turns color at first but then when I mix it goes away. It doesn't stay until it's way brighter then 8.2. I'd still say PH is between 13-14ppm. Should I add the muratic acid after I drain or before?
    7,500 Gallon Pentair CC150 Cartridge Filter Plaster

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    JasonLion's Avatar
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    May 2007
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    Silver Spring, MD
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    37,879

    Re: Am I on the right track

    What you describe doesn't sound like the PH test at all. The normal PH test you add five drops of reagent, invert to mix, and then compare the sample to a color chart. What you are describing sounds a lot more like the FAS-DPD chlorine test, where you add a powder to turn the sample pink, and then add drops to turn it clear again.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
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    Richard320's Avatar
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    Jan 2010
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    San Dimas, CA (LA County)
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    Re: Am I on the right track

    I suspect testing error somewhere.

    There's no way you live in California and have no Calcium! Either you ran the wrong test, or, as I've done before, added the wrong reagent.
    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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