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Thread: Question about numbers and daytime FC loss

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    irishal's Avatar
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    May 2009
    Location
    Edmond, OK
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    37

    Question about numbers and daytime FC loss

    I'm in Oklahoma and the weather here has turned pretty hot. Our pool gets full sun from 8am-8pm. Look at my numbers below and let me know if the daytime loss in FC is normal?? The pool water is clear and sparkling right now.

    Day 1:
    FC 6
    CC 0.5
    TC 6.5
    PH 7.8
    TA 200
    CYA 40
    Temp 88F

    Day 2:
    FC 3.5
    CC 0
    TC 3.5
    PH 7.0 (I'm lowering my TA and aerating)
    TA 160
    CYA 50
    Temp 92F

    Thanks again,
    Alan
    30ft AG
    Alan
    30ft AGP
    2hp pump
    TFTestkits ,Pool Calculator, Pool School

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    reebok's Avatar
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    Apr 2009
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    Lakeland, FL
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    Re: Question about numbers and daytime FC loss

    did you add cya or just a test variance between 40 and 50ppm? some people with full sun like that find 60ppm works a bit better. the average daily loss given out around here is 2ppm, so my guess is that 2.5ppm in full sun would be normal. I think if you put a solar cover on you would lose noticeably less. good idea on aeration.
    16x32 21,000 gallon in-ground exposed aggregate, 1.5hp pump, 120 sqft catridge filter, birdcage, solar panels, aquavac tigershark qc robot.

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    irishal's Avatar
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    May 2009
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    Edmond, OK
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    Re: Question about numbers and daytime FC loss

    Thanks for reply. I am in process of adding CYA. My hope is to get it up there in the 60-70 range. Wanted to make sure that sort of loss is normal.
    Alan
    30ft AGP
    2hp pump
    TFTestkits ,Pool Calculator, Pool School

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    reebok's Avatar
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    Re: Question about numbers and daytime FC loss

    I wouldn't go over 60 if I were you based on what I've read here and seen recommended by the mods. I'm at 70 and wish I was at 50.
    16x32 21,000 gallon in-ground exposed aggregate, 1.5hp pump, 120 sqft catridge filter, birdcage, solar panels, aquavac tigershark qc robot.

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    duraleigh's Avatar
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    Apr 2007
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    Sebring, Florida
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    Re: Question about numbers and daytime FC loss

    Hey. Alan,

    Yeah, reebok offers up some good advice. 70 is hard to back away from. 50-60 CYA even in full sun probably makes more sense. Either way, it's a bit of a gray area but it is very easy to increase in the future and a PITA if you need to go back down.

    BTW, your numbers and your management of your pool water looks very good. I suspect your water looks just as good.
    Dave S. - Forum owner
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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