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Thread: Free chlorine is around 25

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    Free chlorine is around 25

    After I shocked the pool. I believe I put twice the amount of shock I was supposed to. Is this a big problem?
    25k Gallon Gunite Inground Pool
    Pentair FNS PLUS DE filter
    Pentair WhisperFlo WF-24 (seems like single speed)
    Chlorine
    Bel Air, MD 21015

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    JasonLion's Avatar
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    Re: Free chlorine is around 25

    That depends on what your CYA level is. You should always post a full set of water test results with questions like this one. It might also help if you kept this together with one of your other topics, so we could see the context of what was happening recently (which can affect things).
    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: Free chlorine is around 25

    CYA is at 20. Rest of my results are on the other computer. Do I need to do something about the FC?
    25k Gallon Gunite Inground Pool
    Pentair FNS PLUS DE filter
    Pentair WhisperFlo WF-24 (seems like single speed)
    Chlorine
    Bel Air, MD 21015

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    JasonLion's Avatar
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    May 2007
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    Silver Spring, MD
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    37,879

    Re: Free chlorine is around 25

    With CYA around 20, the FC will be far lower by tomorrow afternoon from the sunlight. Given that you have a plaster pool you should be fine at that FC level for 12-16 hours.
    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: Free chlorine is around 25

    Does it matter if I have a solar cover? Should I take it off?
    25k Gallon Gunite Inground Pool
    Pentair FNS PLUS DE filter
    Pentair WhisperFlo WF-24 (seems like single speed)
    Chlorine
    Bel Air, MD 21015

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    JasonLion's Avatar
    Join Date
    May 2007
    Location
    Silver Spring, MD
    Posts
    37,879

    Re: Free chlorine is around 25

    I would take the solar cover off. You want the FC level to come down, since you are at about twice shock level, and the cover might interfere with that.
    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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