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Thread: FC at 25 (!)

  1. #1

    FC at 25 (!)

    We went away for a week, and I left our pump running at the lowest setting and the SWCG running at 60%. We got back today, and when I did the FAS/DPD test, the FC reading was 25 ppm.

    Is there anything I can do, other than shut off the SWCG, take off the solar cover, and wait for the sun to do its thing? At what level will it be safe to swim?

    Thanks,

    Sim
    Hydraulically mundane 20x40 rectangular polymer (~30K gal.), IntelliFlo VS+SVRS pump, IntelliChlor IC40 SWCG, Pentair CCP520 cartridge filter, LED light, 2xDeck Jets, SR Smith Turbo Twister slide

  2. #2
    Senior Member frogabog's Avatar
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    Re: FC at 25 (!)

    What's your CYA level?

    It is generally considered safe to swim at or below shock level in relation to CYA level.

    Pool calculator will answer the question if you plug in your CYA value.
    Where kids swim in 54 degree water, turn blue, and giggle happily cuz they got a POOL!
    Year 3 BBB -15' x 48" Intex Metal Frame - Was using (2) 1000gph Intex cartridge filters (see Full time pumping Intex). 2012, converted to 1600gph and sand filter+SWG = Sand filter love affair!
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  3. #3
    Administrator JasonLion's Avatar
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    Re: FC at 25 (!)

    The most practical this is to take off the cover and let the sun slowly burn of the chlorine. You could purchase chlorine neutralizer, but it is unlikely you are in that much of a hurry.

    When the pool is covered, it uses far less chlorine than it does when the cover is off, so you need to adjust the SWG down correspondingly.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
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  4. #4

    Re: FC at 25 (!)

    CYA is about 40, so the pool calculator says <=15 FC or so should be safe.

    Thanks!

    Sim
    Hydraulically mundane 20x40 rectangular polymer (~30K gal.), IntelliFlo VS+SVRS pump, IntelliChlor IC40 SWCG, Pentair CCP520 cartridge filter, LED light, 2xDeck Jets, SR Smith Turbo Twister slide

  5. #5
    Senior Member Richard320's Avatar
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    Re: FC at 25 (!)

    On the plus side...you know there's no nascent algae bloom. And it sure beats coming home to a green pond.
    16K freeform gunite with spa; Pentair 4000 DE filter; Century Whisperflow 1 HP; Pentair Minimax heater.
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  6. #6
    Senior Member hawkeye's Avatar
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    Re: FC at 25 (!)

    Let pool drift down to normal fc level per you cya chlorine chart also if you haven't read pool school forum yet there is a ton of helpful info there...

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