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Thread: Is this possible, Pool store said...

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    Is this possible, Pool store said...

    My FC is 2.4 and my TC is 0.1. How is that possible. I thought that TC is CC+FC!?!

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    24,000 G, Sand, IG, Vinyl

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    MikeInTN's Avatar
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    Re: Is this possible, Pool store said...

    No, that's not possible. You've got it right, FC + CC = TC.
    24' x 52" AGP - approx 13,500 gallons
    Pentair Optiflo 1 hp/2sp pump w/ Swimpro Voyager 150 sq ft cartridge filter
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    Re: Is this possible, Pool store said...

    My printout actual says that I have -2.4 CC. I even asked about it and I didn't get an answer. Something about being gased out.
    24,000 G, Sand, IG, Vinyl

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    Re: Is this possible, Pool store said...

    Quote Originally Posted by CGS
    My printout actual says that I have -2.4 CC. I even asked about it and I didn't get an answer. Something about being gased out.
    Only thing "gassed out" is the mind of the pool store employee who told you that! This is CLEARLY an example of testing error or you actually have a very high chlorine level that is bleaching out the DPD test. Test with OTO (turns yellow) and if the color is darker than bright yellow (orange, brown, or reddish after standing a few minutes) then you have very high chlorine levels and the DPD test they did (or the strips) are bleaching out!

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    Re: Is this possible, Pool store said...

    Quote Originally Posted by waterbear
    Only thing "gassed out" is the mind of the pool store employee who told you that!
    I spit out my drink laughing at that one!
    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
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    Re: Is this possible, Pool store said...

    Quote Originally Posted by chem geek
    Quote Originally Posted by waterbear
    Only thing "gassed out" is the mind of the pool store employee who told you that!
    I spit out my drink laughing at that one!
    What can I say. I am a product of the '60's!

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    Re: Is this possible, Pool store said...

    How high does the chlorine level need to be in order to skew results like that?
    24,000 G, Sand, IG, Vinyl

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    JasonLion's Avatar
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    Re: Is this possible, Pool store said...

    DPD starts to bleach out a bit above 10 ppm (higher when used with dilution).
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