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Thread: FC Pool Calculator Question

  1. Back To Top    #1

    Join Date
    Mar 2011
    Houston, TX

    FC Pool Calculator Question

    Recently lowered CYA in the pool and changed the settings on the pool calculator. Confused by the FC levels. Pool calculator gives me a range of 3 - 7 with a CYA level of 40. The CYA / Chlorine chart shows a range of 3 - 5. Should I add bleach to maintain a 7 or 5?
    18,500 gallons, Cartridge Filter, In Ground Plaster. Jandy CL460 Filter

  2. Back To Top    #2
    Richard320's Avatar
    Join Date
    Jan 2010
    San Dimas, CA (LA County)

    Re: FC Pool Calculator Question

    Take your pick. The critical thing is to not let it go below 3. How fast you lose FC will determine how high you raise it each time you add some. If you typically lose 2 ppm per day, only raising it to 5 doesn't give you much breathing room if a bunch of dirty, sweaty kids get in.
    16K freeform gunite with spa; Pentair 4000 DE filter; Century Whisperflow 1 HP; Pentair Minimax heater.
    Troublefree does not mean Maintenancefree. It's like brushing your teeth: You can spend a couple minutes a day and pennies a week or go to the dentist once a year and spend several thousand dollars.
    A pool is like a pet - you have to feed it every day, even the days you don't want to play with it!

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