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Thread: Question About FC

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    Join Date
    Jun 2008
    Location
    Avon Park, FL
    Posts
    15

    Question About FC

    On the pool calculator it states my FC goal is between 4 and 8. I haven't got the TF test kit yet and I am using a test kit from Pinch A Penny. My question is, why does it show on the FC test that anything above 5 is too high? Am I still supposed to get it between 4 and 8 or is 5 really too high?
    15200 Gallon, Vinyl, Cartridge Filter 100 GPM, SWG

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    In the Industry

    duraleigh's Avatar
    Join Date
    Apr 2007
    Location
    Sebring, Florida
    Posts
    30,084

    Re: Question About FC

    Hey,

    4-8ppm is your goal. Many kits still think "old-school" and don't consider the buffering affect CYA has on your FC. It is not uncommon, as you probably saw on the chart for FC to be up in the 30's to shock a pool with hgih CYA.

    I realize you're not shocking but just wanted to point out that the thinking of FC over 5 as too hiogh is antiquated.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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    Join Date
    Jun 2008
    Location
    Avon Park, FL
    Posts
    15

    Re: Question About FC

    Ok, I will work with that goal. Also, I read on here where it says to add chlorine at night. I run my pump during the day. Is it better to run it at night when I add the chlorine or run it during the day?
    15200 Gallon, Vinyl, Cartridge Filter 100 GPM, SWG

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    Join Date
    Jan 2009
    Location
    Cupertino, CA
    Posts
    1,966

    Re: Question About FC

    You want to add chemicals while the pump is running, and let it run a while after (at least 1/2 hour, preferably more) to give them a chance to circulate properly.

    It's best to add chlorine after the sun is off the pool for the day, because sunlight will burn up some of your FC; so, your FC has the best chance to attack algae etc if it has all night to work.

    I try to arrange things so the pump turns off before the kids go to bed, because the pump is right outside their rooms. So I'm doing the testing and chemical stuff right at quittin' time rather than after supper.
    --paulr
    BBB "Intermediate Swimmer"
    IG plaster pool 18.5K gal, Hayward Pro-Grid DE filter, 3/4 HP Hydramax II; Polaris 380, 3/4 HP booster
    AG spa 325 gal, probably Sundance of some kind
    Water testing instructions on one page

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