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Thread: Large FC usage, and what level of FC to shoot for?

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    flyboy320's Avatar
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    Jul 2009
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    Burlington, Ontario, Canada
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    Large FC usage, and what level of FC to shoot for?

    Here are my numbers;

    FC = 5
    CC = 0
    TC = 5
    PH = 7.6
    TA = 60
    CH = 90
    CYA = 40
    Borates = 50
    Temp = 88F

    The last couple of days I have been burning up between 4-6 FC a day. I did a drop test last night and it only dropped 1, so I guess those numbers are normal for me. The last two days have been very hot and not a cloud in the sky, and my pool gets full sun for most of the day. We have been swimming for a few hours each day and have had tons of pollen, actually dandelion fluff in the pool as well (just above the water line in the skimmer there is a yellow scum line from all the pollen). Water is clear and no apparent problems that I can tell from the look of the water.

    So I have a couple of questions.

    1. Is the chlorine loss I'm getting reasonable (I know each pool is different )?

    2. If I am adding chlorine in the morning, how much FC am I trying to shoot for when I test again the following morning? I see the CYA chart says for a CYA of 40, the ideal value is 5, and min is 3. So in the morning prior to adding the chlorine for the day, do I want the FC to be at 5, or 3?
    10K gal IG, vinyl, 1 HP Jandy Stealth pump, Jandy CS cartridge filter, Delta UV system, Hasa Liquidator

  2. Back To Top    #2
    Richard320's Avatar
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    Jan 2010
    Location
    San Dimas, CA (LA County)
    Posts
    15,422

    Re: Large FC usage, and what level of FC to shoot for?

    Quote Originally Posted by flyboy320
    Here are my numbers;

    FC = 5
    CC = 0
    TC = 5
    PH = 7.6
    TA = 60
    CH = 90
    CYA = 40
    Borates = 50
    Temp = 88F

    The last couple of days I have been burning up between 4-6 FC a day. I did a drop test last night and it only dropped 1, so I guess those numbers are normal for me. The last two days have been very hot and not a cloud in the sky, and my pool gets full sun for most of the day. We have been swimming for a few hours each day and have had tons of pollen, actually dandelion fluff in the pool as well (just above the water line in the skimmer there is a yellow scum line from all the pollen). Water is clear and no apparent problems that I can tell from the look of the water.

    So I have a couple of questions.

    1. Is the chlorine loss I'm getting reasonable (I know each pool is different )?

    2. If I am adding chlorine in the morning, how much FC am I trying to shoot for when I test again the following morning? I see the CYA chart says for a CYA of 40, the ideal value is 5, and min is 3. So in the morning prior to adding the chlorine for the day, do I want the FC to be at 5, or 3?
    There's something using your Chlorine, and it isn't the sun at night.

    Could be pollen, could be the swimmer load, could be - gasp - algae. You might want to push it up to shock level for a couple days, just to be sure. Beyond that, you want to keep enough Chlorine in there so that it doesn't drop below 3 before you can add more. If you're losing 4/day, then bump it up to 7.

    A little more CYA will slow the loss, if you're in full sun.
    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!

  3. Back To Top    #3
    flyboy320's Avatar
    Join Date
    Jul 2009
    Location
    Burlington, Ontario, Canada
    Posts
    213

    Re: Large FC usage, and what level of FC to shoot for?

    OK, makes sense.

    It was at 5.5 this morning, added enough to bring it up to 9.5, and tonight it was at 3.5, so I added enough to bring it back up to 4, and hopefully it will be at 3 in the morning, and I'll go from there.
    10K gal IG, vinyl, 1 HP Jandy Stealth pump, Jandy CS cartridge filter, Delta UV system, Hasa Liquidator

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