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Thread: Number Changes after series of heavy rain storms

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    Marcm15's Avatar
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    Jul 2010
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    Orange County, NY
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    41

    Number Changes after series of heavy rain storms

    I am looking for some direction as to how to proceed in getting my pool back in balance after several heavy rain storms that dumped a large volume of water and debris into the pool. I have cleaned debris and water is clear but my PH and TA have dropped.

    FC - 7
    CC - .5
    TC - 7.5
    PH - 6.8
    TA - 60
    CYA - 20

    Water temp at time of tests - 74 and I am not concerned at this point of CH because I have a vinyl liner so I didn't run that test.

    I am learning the pool calculator and it states 74oz of Borax to raise PH and 49oz of Baking Soda to Raise the TA. I just don't know which to do first or if the .5 CC means I should shock first. This is all starting to make a lot of sense to me now. I just need to boost my confidence a little more before I make changes on my own.

    Thanks in advance for your help.
    ~21 ft Round
    ~52 inches high
    ~11,500 Gallons
    ~Hayward EC50 DE Filter and a 1hp pump. Flow Rate of 50 GPM

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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: Number Changes after series of heavy rain storms

    CC at 0.5 or lower is fine. If you are concerned about it, raise the FC level a little higher than usual and that will take care of it.

    You should raise the PH first. Raising PH will raise TA just a little, so measure the TA again an hour after raising the PH and see if it still needs adjustment. Keep in mind that the PH test can't read lower than 6.8, so your actual PH might be lower. As with many things, test, adjust, and then test again after an hour to see if it needs further adjustment.

    Your CYA level is too low, you should bring it up to around 40 (unless you already added some CYA less than a week ago).
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
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    Marcm15's Avatar
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    Jul 2010
    Location
    Orange County, NY
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    Re: Number Changes after series of heavy rain storms

    Thanks Jason I will adjust and test again...
    ~21 ft Round
    ~52 inches high
    ~11,500 Gallons
    ~Hayward EC50 DE Filter and a 1hp pump. Flow Rate of 50 GPM

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