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Thread: Normal daily FC Loss?

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    Normal daily FC Loss?

    Split from fc-loss-overnight-t67268.html
    Please start your own thread when you ask a question Butterfly


    And what would be normal daily FC loss for a hot sunny day with bathers ? 2 ppm ?
    In-ground 16'x32' rectangular, 3' shallow, 8' deep, approx. 76k Litres
    1HP Jacuzzi Magnum, sand filter, heat-pump, chlorine dispenser
    Taylor K-2006 test kit
    Up to july 2013: Cal-hypo 65% along with weekly tablets (2) of trichlor in dispenser
    Moving to: 6% bleach
    Montreal, Canada

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    pwrstrk's Avatar
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    Re: FC Loss overnight

    2-3 ppm in the conditions you describe would be normal.


    Jeff
    24'x54" AG Morada RTR (by wilbar) 13'500 gal. Hayward Powerflo Matrix 1hp 2 speed. Hayward Perflex EC65 DE filter.

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    Re: Normal daily FC Loss?

    I'm contemplating moving from Cal-Hypo to bleach.

    I have access to 2.85L jugs at Canadian Tire for a decent price ($1.19 I think).

    According to my pool calculator app, raising FC by 2.5 ppm for my pool (76k litres) takes 1.5 jugs.

    So, a sunny week would require 7 x 1.5 jugs = 10.5 jugs / week !!!

    Is this at all realistic ? I don't really care about the cost, it's the hauling of jugs / storage that'd be a bother...
    In-ground 16'x32' rectangular, 3' shallow, 8' deep, approx. 76k Litres
    1HP Jacuzzi Magnum, sand filter, heat-pump, chlorine dispenser
    Taylor K-2006 test kit
    Up to july 2013: Cal-hypo 65% along with weekly tablets (2) of trichlor in dispenser
    Moving to: 6% bleach
    Montreal, Canada

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    Re: Normal daily FC Loss?

    What is your CH level now?
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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    pwrstrk's Avatar
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    Re: Normal daily FC Loss?

    What is your CYA level and what test kit are you using?


    Jeff
    24'x54" AG Morada RTR (by wilbar) 13'500 gal. Hayward Powerflo Matrix 1hp 2 speed. Hayward Perflex EC65 DE filter.

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    Re: Normal daily FC Loss?

    CYA is 40, CH is 200.

    I was using Cal-Hypo along with 2 trichlor tablets in a dispenser once a week until this week.

    That's when I got my Taylor K-2006.

    CYA is 40 and CH is 200.

    Should I continue adding trichlor tablets until I reach CYA 50 ? My understanding is that the more CYA I have, the longer the FC will last (although I'll need to keep the level higher) ?
    In-ground 16'x32' rectangular, 3' shallow, 8' deep, approx. 76k Litres
    1HP Jacuzzi Magnum, sand filter, heat-pump, chlorine dispenser
    Taylor K-2006 test kit
    Up to july 2013: Cal-hypo 65% along with weekly tablets (2) of trichlor in dispenser
    Moving to: 6% bleach
    Montreal, Canada

  7. Back To Top    #7
    pwrstrk's Avatar
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    Re: Normal daily FC Loss?

    I would go no higher than 50 ppm of CYA. You don't have a SWG do you ?

    Put your pool info in your sig, it will help us help you.


    Jeff
    24'x54" AG Morada RTR (by wilbar) 13'500 gal. Hayward Powerflo Matrix 1hp 2 speed. Hayward Perflex EC65 DE filter.

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    Re: Normal daily FC Loss?

    Using Cal Hypo is fine for your pool. Test and manage your water so it doesn't get above around 400 and you should have no issues.

    There's diminishing return on increased CYA levels. I would agree with pwrstrk's advice.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

  9. Back To Top    #9

    Re: Normal daily FC Loss?

    Added signature...

    Is FC degradation a linear function ?

    I mean, for the same amount of sunshine, if I started the day with FC = 16 and ended at 13, would it have gone from 5 to 2 on the same day, all else being equal ?
    In-ground 16'x32' rectangular, 3' shallow, 8' deep, approx. 76k Litres
    1HP Jacuzzi Magnum, sand filter, heat-pump, chlorine dispenser
    Taylor K-2006 test kit
    Up to july 2013: Cal-hypo 65% along with weekly tablets (2) of trichlor in dispenser
    Moving to: 6% bleach
    Montreal, Canada

  10. Back To Top    #10
    pwrstrk's Avatar
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    Re: Normal daily FC Loss?

    I'm not sure on that. Sometimes higher fc levels lower faster i think. Lots of factors come into play with FC loss.

    That's a good question for chemgeek, or the other experts.


    Jeff
    24'x54" AG Morada RTR (by wilbar) 13'500 gal. Hayward Powerflo Matrix 1hp 2 speed. Hayward Perflex EC65 DE filter.

  11. Back To Top    #11

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    Re: Normal daily FC Loss?

    It's not linear, it's a percentage.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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