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Thread: FC at 40. Too high for fiberglass?

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    FC at 40. Too high for fiberglass?

    I'm trying to kill algae. FC measured 40 this a.m. How high can I go before it damages fiberglass pool? Metal steps have not been installed yet.

    SWG has been used along with bleach to get FC up. Usually SWG is on 5% for 5-7ppm. Can I leave it on 100% for 2 days to maintain high levels w/o hurting it?
    Plaster pool inground 22,000 gallons with spa. Pentair Intelliflo, IC40 salt generator, WiFi control/Easy Touch.
    Hayward 1.5 HP pump on 750 gallon spa. Sand filters. Auto chlorinator on spa. Auto water level. Dolphin M500. TF100 XL with Speed Stir

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    duraleigh's Avatar
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    Re: FC at 40. Too high for fiberglass?

    What is your CYA?
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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    JasonLion's Avatar
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    Re: FC at 40. Too high for fiberglass?

    It all depends on your CYA level.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
    Creator of PoolMath and Pool Calculator. Other handy links: Support this site, TF Test Kits, Pool School

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    Re: FC at 40. Too high for fiberglass?

    Cya 75-80
    Plaster pool inground 22,000 gallons with spa. Pentair Intelliflo, IC40 salt generator, WiFi control/Easy Touch.
    Hayward 1.5 HP pump on 750 gallon spa. Sand filters. Auto chlorinator on spa. Auto water level. Dolphin M500. TF100 XL with Speed Stir

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    JasonLion's Avatar
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    Re: FC at 40. Too high for fiberglass?

    With CYA that high you are fine, there isn't any risk of damage.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
    Creator of PoolMath and Pool Calculator. Other handy links: Support this site, TF Test Kits, Pool School

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    Re: FC at 40. Too high for fiberglass?

    I don't think you'll damage the SWCG, but will reduce life of the cell...
    I think most people shut it down and use bleach to shock
    24ft x 52in AGP 18000 gal
    sand filter, 200#,1.5 hp single speed pump
    Wood deck (still in progress...)

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