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Thread: is 5ppm FC loss in a day normal?

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    is 5ppm FC loss in a day normal?

    I did overnight loss test and lost 0ppm FC from yesterday evening to this morning. CC still at 0

    Kids swam today for about 3 hours. According to local weather data temp got up to 76F today. Pool gets direct sunlight for a few hours.

    I don't remember losing that much FC a day last year.

    I recently posted numbers from last night, here they are again:

    TA=60
    CH=0
    CYA=50
    PH=7.6 (could be 7.8, I'm using a cheap no-name kit for PH right now, have a Taylor on the way).
    24' x 52" AGP = 13.5k gallons
    Dynamo 2.0 HP pump,Sand Dollar sand filter
    Polaris 65 vacuum (good when there are a ton of leaves on bottom), Pool Rover Jr. (LOVE it, but power box dead right now), AquaCritter (an excellent suction side cleaner)

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    mas985's Avatar
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    Re: is 5ppm FC loss in a day normal?

    It depends on the FC level. If it is 10 ppm or above, that might be a normal loss. If the FC level is 5 ppm in the morning and 0 at night, that is a different issue.
    Mark
    Hydraulics 101; Pump Ed 101; Pump/Pool Spreadsheets; Pump Run Time Study; DIY Acid Dosing; DIY Cover Roller
    18'x36' 20k plaster, MaxFlo SP2303VSP, Aqualogic PS8 SWCG, 420 sq-ft Cartridge, Solar, 6 jet spa, 1 HP jet pump, 400k BTU NG Heater

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    JasonLion's Avatar
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    Re: is 5ppm FC loss in a day normal?

    With CYA at 50, losing about 50% of your starting FC level over 24 hours to sunlight is normal. With many hours of swimming, additional loses are to be expected. So, 5 ppm might well be reasonable, depending on what your starting FC level was.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
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    Re: is 5ppm FC loss in a day normal?

    sorry... forgot to add that info. It was in my other thread.

    Starting FC was 8.

    Pool calc says recommended CYA level is 30 to 50, recommended FC is 4-8. My CYA was at 50 so I'm trying to maintain upper level of recommended FC at 8.

    I'll need a little more than a gallon of 6% a day I guess.
    24' x 52" AGP = 13.5k gallons
    Dynamo 2.0 HP pump,Sand Dollar sand filter
    Polaris 65 vacuum (good when there are a ton of leaves on bottom), Pool Rover Jr. (LOVE it, but power box dead right now), AquaCritter (an excellent suction side cleaner)

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    dmanb2b's Avatar
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    Re: is 5ppm FC loss in a day normal?

    hmm...one gallon...I know that's about 5ppm in 13.5k gals, but that seems excessive. We have the same size pool...pool is exposed to sunlight from 7am-4pm...I never recall burning through that much

    If that is truly your chlorine requirement you may be better off just getting an intex swg...that's a lot of bleach
    24'x52" AGP (13,500 Gallons), Intex SWG, (2)Solar Bear 4x20 panels, Hayward S220T Filter, 1/2hp Pentair Superflo

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    JasonLion's Avatar
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    Re: is 5ppm FC loss in a day normal?

    That chlorine loss makes a lot of sense, given two+ kids swimming for three hours. 50% loss would be about 3-4 ppm to sunlight and an additional 1-2 ppm for kids swimming, give or take.
    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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    dmanb2b's Avatar
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    Re: is 5ppm FC loss in a day normal?

    Oh I trust you Jason...just seems like a lot of bleach daily for a 24" pool. Then again every pool is slightly diff and we did use the solar cover a lot which would also help hold the chlorine levels
    24'x52" AGP (13,500 Gallons), Intex SWG, (2)Solar Bear 4x20 panels, Hayward S220T Filter, 1/2hp Pentair Superflo

    Pool School, TFTestKits, Pool Calculator

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    Re: is 5ppm FC loss in a day normal?

    Quote Originally Posted by dmanb2b
    If that is truly your chlorine requirement you may be better off just getting an intex swg...that's a lot of bleach
    Yes and a lot of trips to the store as I don't have a 'handy' place to store 30 gallons of bleach (monthly usage, I hate hauling bleach bottles). And I'm trying to find 10-12.5% for two reasons, hopefully cheaper per ppm and also less storage space.

    I also agree about the Intex SWG. I think I see it in my near future in about a month

    Quote Originally Posted by JasonLion
    That chlorine loss makes a lot of sense, given two+ kids swimming for three hours. 50% loss would be about 3-4 ppm to sunlight and an additional 1-2 ppm for kids swimming, give or take.
    3 kids actually. At least I know it's somewhat 'normal'. It's ok as long as I know I'm doing everything right. I guess last year I wasn't as consistent as I'm trying to be now. I would just dump some bleach in every day but not check it but once a week. I knew I wasn't putting too much and had to end up shocking a few times because of not adding enough so I'm on top of it this year with knowing exactly how much is used a day.

    Quote Originally Posted by dmanb2b
    and we did use the solar cover a lot which would also help hold the chlorine levels
    Yeah I want to get a solar cover eventually. I think first I'll get the Intex SWG as it's not a whole lot more than a good cover.
    24' x 52" AGP = 13.5k gallons
    Dynamo 2.0 HP pump,Sand Dollar sand filter
    Polaris 65 vacuum (good when there are a ton of leaves on bottom), Pool Rover Jr. (LOVE it, but power box dead right now), AquaCritter (an excellent suction side cleaner)

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