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Thread: CH went from 300 to 230 in 24 hrs

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    CH went from 300 to 230 in 24 hrs

    Hello,

    The CH dropped from 300 yesterday to 230 today. Is this common? If so, what effects can it have, if any?

    Yesterday's numbers:

    FC = 5
    pH = 7.4
    TA = 100
    CH = 300
    CYA = 30
    Temp = 80

    I added 580 oz of 6% bleach to bring FC to 13 (I feel like I'm in shock mode all summer).

    Today's numbers:


    FC = 9.5
    pH = 7.6
    TA = 110
    CH = 230
    CYA = 30
    Temp = 86

    Thanks for any advise.
    Sirena~
    Phoenix, AZ
    35-40K gals; Sand Filter; In Ground; Plaster; Sta-Rite System3 130 GMP.

  2. Back To Top    #2
    Richard320's Avatar
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    Jan 2010
    Location
    San Dimas, CA (LA County)
    Posts
    18,768

    Re: CH went from 300 to 230 in 24 hrs

    I suspect testing error.

    Calcium doesn't just disappear. The only way it went down was if you drained and refilled a quarter of your pool. But CYA didn't drop the same amount, so you obviously didn't drain.

    I'd actually be suspicious of both those CH results, since Phoenix is noted here on the forum as having very hard water with very high CH readings.
    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.
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    In the Industry

    Join Date
    Jul 2011
    Location
    Myrtle Beach, SC aka Redneck Riveria
    Posts
    125

    Re: CH went from 300 to 230 in 24 hrs

    Your pool rose 6 degrees overnight????

    What are you using to test your water? Test strips? Taylor?
    "When your pool is sick, call the doctor, I make house calls"
    One stop pool shop, I do everything but install them. 9+ years of experience.

  4. Back To Top    #4

    Re: CH went from 300 to 230 in 24 hrs

    I thought it was a testing error also, so tested it twice. I haven't drained any and Phoenix does have hard water. We had a little rain overnight - less than 1/2 inch. CH has been around 300 for about a month now. It was much higher.

    Using the Taylor test kit. Yesterday's temp is probably an error as the thermometer is difficult to read. Since it was overcast all day yesterday, rain overnight, and temp this a.m. is 86, it would make sense that I misread it and was probably 90.
    Sirena~
    Phoenix, AZ
    35-40K gals; Sand Filter; In Ground; Plaster; Sta-Rite System3 130 GMP.

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