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Thread: Excessive FC loss? Or something sinister.

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    Join Date
    Jul 2012
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    Forest, VA
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    Excessive FC loss? Or something sinister.

    This morning (715am)
    FC 15.5
    CC 0.5
    Cya 40
    pH 7.5
    Alk 110
    This afternoon (4pm)
    FC 8
    CC 0.5
    Cya pH alk same.
    My pool gets sun almost the whole day.
    Is this normal FC loss for a day with my cya or could something nasty be in the water? I am planning on an OCLT soon (prob Tuesday). I'm am almost out of R-0871 solution which is why I haven't started the process yet. Thanks for any replies.
    12,000 gal Octagon vinyl in-ground pool. Hayward S220 sand filter 3/4 hp pump, heat pump heater

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    AimeeH's Avatar
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    Re: Excessive FC loss? Or something sinister.

    Wellllllll, do you suspect something sinister since you had your chlorine at 15.5 with a CYA of 40? That is shock level not maintenance level. So with that.....I'd suspect something sinister.
    18*36*23 true "L" vinyl IG 29,000 gallons. SWG. TF-100 test kit.
    http://tftestkits.net/splash-page.html

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    Re: Excessive FC loss? Or something sinister.

    The last few days we have had heavy bather loads and seemed like my FC would drop more than it should. So I brought up to shock level and wanted to see how much I lose in a typical day. Just seems like a lot
    12,000 gal Octagon vinyl in-ground pool. Hayward S220 sand filter 3/4 hp pump, heat pump heater

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    AimeeH's Avatar
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    Re: Excessive FC loss? Or something sinister.

    How does the water look?

    Do the OCLT for sure. And if that good then you might want to increase the CYA.
    18*36*23 true "L" vinyl IG 29,000 gallons. SWG. TF-100 test kit.
    http://tftestkits.net/splash-page.html

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    Re: Excessive FC loss? Or something sinister.

    Water looks good. Deep end just a touch hazy.
    Attached Images Attached Images
    12,000 gal Octagon vinyl in-ground pool. Hayward S220 sand filter 3/4 hp pump, heat pump heater

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    AimeeH's Avatar
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    Re: Excessive FC loss? Or something sinister.

    OCLT in order but hazy water at high CL consumption= SLAM.
    18*36*23 true "L" vinyl IG 29,000 gallons. SWG. TF-100 test kit.
    http://tftestkits.net/splash-page.html

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