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Thread: Is fc too low?

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    Is fc too low?

    I been running my pump for 12 hours per day and here are my numbers:
    fc-2.5
    cc-0
    ph-7.9
    ta-80
    ch-230
    cya-85

    Is my fc level too low with a cya of 85? I have a swg and the pool is in direct sun all day.
    20,000 gallon viking fiberglass pool w/aqua comfort heat pump, pentair whisperflo pump 1.5hp autopilot dig-220 swg w/RC42 cell (42,000), pg2000 fiber optic lights
    hayward sand filter(medium is echoglass)
    Blue diamond robot cleaner

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    Re: Is fc too low?

    How does your water look?

    If it's crystal clear with absolutely no sign of algae or cloudiness, you FC is most likely okay.

    Generally, speaking, that's a little lower than most pools should be, tho. (Check the FC/CYA relationship Chart up in Pool School)

    Your pump run time is certainly adequate so perhaps you could boost the percentage on your SWG if you decide to bring FC up a little.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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    Re: Is fc too low?

    The odd thing is my swg is at max output. The pool water is clear but would be happy if fc was higher. Would I have too shock and extend pump time to maintain a higher level?
    20,000 gallon viking fiberglass pool w/aqua comfort heat pump, pentair whisperflo pump 1.5hp autopilot dig-220 swg w/RC42 cell (42,000), pg2000 fiber optic lights
    hayward sand filter(medium is echoglass)
    Blue diamond robot cleaner

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    Re: Is fc too low?

    Oh, one more thing my salt level is 4000 ppm which is what manufact. recommends.
    20,000 gallon viking fiberglass pool w/aqua comfort heat pump, pentair whisperflo pump 1.5hp autopilot dig-220 swg w/RC42 cell (42,000), pg2000 fiber optic lights
    hayward sand filter(medium is echoglass)
    Blue diamond robot cleaner

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    Re: Is fc too low?

    Hmm, that may tell us you have some invisible organics(algae) starting in there?

    Do you know and understand the Overnight FC Loss Test? It's in Pool School if you're not familiar.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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    reebok's Avatar
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    Re: Is fc too low?

    seems low to me. are you using that duoclear system? introduces cya I believe which you don't want more of. I wouuld do the overnight fc loss test if you have a fas-dpd test.
    pool-school/overnight_fc_test
    16x32 21,000 gallon in-ground exposed aggregate, 1.5hp pump, 120 sqft catridge filter, birdcage, solar panels, aquavac tigershark qc robot.

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    Re: Is fc too low?

    I will try the overnight test tonight.
    20,000 gallon viking fiberglass pool w/aqua comfort heat pump, pentair whisperflo pump 1.5hp autopilot dig-220 swg w/RC42 cell (42,000), pg2000 fiber optic lights
    hayward sand filter(medium is echoglass)
    Blue diamond robot cleaner

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