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Thread: FC level not dropping, advice?

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    FC level not dropping, advice?

    First pool, was SLAM'd (assuming) prior to this purchase at the end of Sept., so FC levels have always been high. They've come down, but they're still really high. Am I doing the right thing here?

    Should I add chemicals to lower the FC level?

    Current condition: Clear, looks gorgeous, no chlorine tabs have been added since Oct (when I bought the house)

    Pool 1/12
    58 degrees F
    FC - 15ppm
    CC - 0ppm
    pH - 7.4
    TA - 80ppm
    CH - 325ppm
    CYA - 0?

    Pool 12/24
    58 degrees F
    FC - 15ppm
    CC - 0.5ppm
    pH - 7.3 (base demand - 1 drop to 7.6)
    TA - 50ppm
    CH - 325ppm
    CYA - not tested

    10/24
    26ppm FC
    .5ppm CC
    7.2ph
    25 TA
    450 CH
    60 CYA

    11/3 (first test & still learning, results probably off)
    22ppm FC
    0ppm CC
    7.4 pH
    40TA
    400CH
    40CA
    ~12k gallon, cartridge filter, IG, plaster, 2hp Pentair Whisperflo WF-28, 150gpm filter

    Pics: http://imgur.com/a/HqaPq#0

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    pwrstrk's Avatar
    Join Date
    Aug 2012
    Location
    Elverson Pa.
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    FC level not dropping, advice?

    The cooler water temps will have an effect on your FC drifting down. Cold water holds FC levels longer.

    Don't add anything to help it out. It'll drift down on its own.

    How did you come up with zero CYA ?
    Jeff
    24'x54" AG Morada RTR (by wilbar) 13'500 gal. Hayward Powerflo Matrix 1hp 2 speed. Hayward Perflex EC65 DE filter.

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    Re: FC level not dropping, advice?

    Quote Originally Posted by pwrstrk
    How did you come up with zero CYA ?
    Thanks, I didn't - just a guess. I've always found the CYA test to be subjective. "When the black dot disappears", **** I can see it pretty good! Just a little disappear, all gone? When I did the last test, it was filled up to the brim (the tester), so I just assumed it was below 30 or at zero.

    Figured that since CYA is just a FC breakdown inhibitor (right?), that I could let it stay low while the FC levels are high. Am I wrong in this assumption?
    ~12k gallon, cartridge filter, IG, plaster, 2hp Pentair Whisperflo WF-28, 150gpm filter

    Pics: http://imgur.com/a/HqaPq#0

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    pwrstrk's Avatar
    Join Date
    Aug 2012
    Location
    Elverson Pa.
    Posts
    4,758

    Re: FC level not dropping, advice?

    When your doing the CYA test, it should be done outdoors with full sun and the sun at your back. Hold the test tube at waist height. When the black dot disappears take your reading. Also let the pool water sample come to room temp since your water is a little cold.

    On 10/24 you stated your CYA was 60. Have you replaced any water since then ?
    Jeff
    24'x54" AG Morada RTR (by wilbar) 13'500 gal. Hayward Powerflo Matrix 1hp 2 speed. Hayward Perflex EC65 DE filter.

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    Re: FC level not dropping, advice?

    Quote Originally Posted by pwrstrk
    On 10/24 you stated your CYA was 60. Have you replaced any water since then ?
    Thanks, I'll try this on the next test. I tend to lose about .5" a week, so I'll add water when it looks low.
    ~12k gallon, cartridge filter, IG, plaster, 2hp Pentair Whisperflo WF-28, 150gpm filter

    Pics: http://imgur.com/a/HqaPq#0

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