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Thread: does CYA affect FC?

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    Join Date
    Jul 2013
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    North Canton, OH
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    192

    does CYA affect FC?

    Pool is crystal clear, autocover is closed except when I am checking things, zero bather load and I have passed OCLT. FC is up around 16, and I have been bringing the CYA to my target of 40. As I have brought the CYA up over the last week, it seems like adding CYA makes the FC go down a bit. FC was nice and steady, I added CYA to go 5 to 25 over a couple days (in a sock), and FC dropped a couple while I was adding. Once CYA was all dissolved, FC was steady a couple days again. Then when I added CYA again to go 25 to 40, the FC again dropped a couple. Is the CYA tying up FC or something?
    30,000 gal IG 20x40 8ft deep end vinyl liner in NE Ohio DOB Sept 2012
    Hayward 4820 DE filter, Hayward SP2610x15 1.5HP single speed pump
    Hayward H400FDN natural gas heater, Frog min'l/Cl2 system (not in use)
    autocover, Dolphin DX4 cleaner, well water, TF100 test kit

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    duraleigh's Avatar
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    Apr 2007
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    Sebring, Florida
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    Re: does CYA affect FC?

    No, essentially the CYA has no affect on the measurable FC so what you saw as a drop in your FC is unexplained. I would not be very concerned about it. Are you taking the FAS/DPD test to it's absolute endpoint? (the last drop makes absolutely no more color change and then subtract that drop)
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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    Join Date
    Jul 2013
    Location
    North Canton, OH
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    192

    Re: does CYA affect FC?

    thanks for the reply, Dave - I have not been doing the "extra" drop and subtracting - I will start doing that - and in all honesty, once I am up at high FC levels, I am doing it pretty quickly, so my drop size may not be all that consistent which may contribute to some unexplained variation
    30,000 gal IG 20x40 8ft deep end vinyl liner in NE Ohio DOB Sept 2012
    Hayward 4820 DE filter, Hayward SP2610x15 1.5HP single speed pump
    Hayward H400FDN natural gas heater, Frog min'l/Cl2 system (not in use)
    autocover, Dolphin DX4 cleaner, well water, TF100 test kit

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