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Thread: FC vs CC?

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    Johnmarkpainter's Avatar
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    FC vs CC?

    So I have been trying to bring my FC levels down.

    Today, my FC was 3 but I had some CC.
    I am going to test again later to make sure it isn't above .5.
    It has been Zero all week.
    How do you enter CC into PoolMath?
    Do you just add it onto your FC?

    PH 7.8 (going to buy MA now)
    FC 3.5
    TA 120
    CH 500
    CYA 55
    Salinity 3,000 (need to raise it to about 3,600)
    28,000 Gallon, IG, Vinyl, SWG, Sand Filter
    Goldline Aqua Rite SWG
    Hayward Pro Series Sand Filter
    Flotec Pump
    Hayward Turbulent Flo Chamber

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    Pool Tool's Avatar
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    Re: FC vs CC?

    You don't enter CC at all, it is simply a function of the reactions in your pool and a way to identify issues. With an elevated CC (>0.5) there is a potential for a significant amount of algae, much less than what can be seen, in the pool. Test again and if 0.5 or less no issue, if higher then its time to SLAM. Do not add it to your FC either.
    16' x 32' (21100 gal), vinyl, 1.5 hp Hayward SuperPump,
    Tagelus TA60/60D Sand Filter, Raypak 399K Digital Heater, TF-100

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    lefty51's Avatar
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    Re: FC vs CC?

    Pool Tool is right on. I look at CC as chlorine that has done its job at killing algae. That's over simplifying it, but the CC reading lets you know there is something in the pool the FC is destroying. The higher your CC is means your FC is attacking something. That's why when doing a SLAM they tell you that once you pass the OCLT where your FC is holding and the CC is .5 or less you have beaten the algae problem (along with a clear and sparkling pool that is)

    Hope that helps
    Si -central Mo. 32' x 16' -- 3'4" to 6' deep Vinyl liner - 16,500 Gals : Triton II filter -Duraglass 2 hp pump - 1 speed : SI-30 salt generator
    TF-100 with speedstir

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    pabeader's Avatar
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    Re: FC vs CC?

    The overriding question is, "Why are you bringing your FC down?" With a CYA of 60 you need to be up around 4 no less then 3.
    Bob - Palm Beach by San Juan Pools. approx 5000 gals., Pentair 320 cartridge filter (all new guts installed by me), Goldline SWG, 'New to me' Kreepy Krauly Sand Shark, Intermec 104 Timer Test kit: TF-100 w/Speed Stir

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    lefty51's Avatar
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    Re: FC vs CC?

    Quote Originally Posted by pabeader View Post
    The overriding question is, "Why are you bringing your FC down?" With a CYA of 60 you need to be up around 4 no less then 3.
    Good point and with SWG you want CYA in 70-80 and I would tend to stay in the 7.0 range for FC
    Si -central Mo. 32' x 16' -- 3'4" to 6' deep Vinyl liner - 16,500 Gals : Triton II filter -Duraglass 2 hp pump - 1 speed : SI-30 salt generator
    TF-100 with speedstir

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    Johnmarkpainter's Avatar
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    Re: FC vs CC?

    My FC was 7.5 with CYA of 20.
    With a CYA of 60 (still low for SWG pool), my target FC is 4.

    I'm just getting my head around regulating the SWG.
    28,000 Gallon, IG, Vinyl, SWG, Sand Filter
    Goldline Aqua Rite SWG
    Hayward Pro Series Sand Filter
    Flotec Pump
    Hayward Turbulent Flo Chamber

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