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Thread: Keeping FC in target zone

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    Keeping FC in target zone

    First I just have to brag and say that my pool has never been as clean as it is now and as crystal clear since I started the BBB system a few weeks ago. Thanks to everyone here for what you do! I only wish I had found you guys 5 years ago.

    I have a question that I haven't seen posted anywhere. I'm still really new at figuring all of this stuff out. My question is how much to raise the FC at night when I put in bleach to prepare for the next day. My FC has been dropping down to around 7 in the evenings. My target FC for CYA of 60 is listed as between 5-7. I've been adding around 112 oz at night which has been bringing FC back up to around 11.5 to prepare for the next day. Is this not the correct way to do this? I'm just not sure on the technique on how to keep the FC in the target zone. I appreciate anyone's help!!
    13,500 AG pool w/ AquaTools sand filter

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    JasonLion's Avatar
    Join Date
    May 2007
    Silver Spring, MD

    Re: Keeping FC in target zone

    The idea is to never go below the minimum of 5. You want to add enough in the evening so it is at least 5 the next evening, preferably 6 so you have a little safety margin. If you are getting 7 the next evening, you could lower the level you target just a little, so it ends up at 6. Of course there is no harm in having it end up at 7, which is really just a larger safety margin, if you want to.

    I hope that makes sense
    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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    Richard320's Avatar
    Join Date
    Jan 2010
    San Dimas, CA (LA County)

    Re: Keeping FC in target zone

    You have it figured out perfectly.
    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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