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Thread: What am I fighting?

  1. Back To Top    #1

    Join Date
    Jul 2011
    Location
    Indianapolis
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    What am I fighting?

    If my FC gets eaten up during the day (maybe 7 in the morning and 0.5 by evening), but the pool has 0 or 0.5 CC in the evening... am I battling algae or the sun?

    I guess what I'm asking is, if it were algae, wouldn't I see higher CC?


    For instance, yesterday morning:

    FC: 7
    CC: 0
    TA: 200
    pH: 7.6
    CYA: 50
    Water temp: 89

    Air temp yesterday was 94 degrees, lots of sun, pool was open (automatic cover) from 7a-12p and again from 5p-9p. At 9p:

    FC: 0.5
    CC: 0
    TA: 200
    pH: 7.6
    CYA: 50
    Water temp: 93

    When I'm down to 0 or close to 0 on FC, the seams of my liner darken up. The water is consistently very clear.

    My only guess is that I'm (still) fighting algae, which FC consumes, then more FC consumes the CC, and when I test, both are cancelled out. Is this off-base?
    19000 gallon IG installed in 2003, owned by me since 2010, vinyl liner, 18x36, Sta-Rite PLM-150 cartridge filter, 1hp AOSmith motor on <brand unknown> pump, automatic cover, BBB since August 2011

  2. Back To Top    #2

    Join Date
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    Re: What am I fighting?

    Perform the overnight chlorine loss test, post results.
    Built in 1957 44,000 gallon in-ground, Wet Edge Primera Stone in Sky Blue, Intelliflo VF Pump, 600 lb. Pentair Triton II TR-100 Sand Filter, CircuPool RG 60 Plus SWG, TF-100 test kit
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  3. Back To Top    #3

    Join Date
    Jul 2011
    Location
    Indianapolis
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    Re: What am I fighting?

    Sure. Should have mentioned that. Two nights ago, I raised FC to 14 after the pool was out of the sun, and then the next morning (see results above) I was at 7.... but the CC was 0, which is what's confusing me. When I was battling the hardcore algae at open this year, my CC would be off the charts.
    19000 gallon IG installed in 2003, owned by me since 2010, vinyl liner, 18x36, Sta-Rite PLM-150 cartridge filter, 1hp AOSmith motor on <brand unknown> pump, automatic cover, BBB since August 2011

  4. Back To Top    #4
    Mod Squad Bama Rambler's Avatar
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    Re: What am I fighting?

    It's more common to have no CC's even with algae than it is to have them. Given that you lost 7 ppm FC overnight you need to start the shock process and keep it at shock level for your CYA until you pass the OCLT.
    Dave J. TFP Moderator
    24' x 52" Round AGP. 2hp/¼hp SPL Power-Flo 2-speed pump. 200sqft Waterway Cartridge Filter. 45MHP2(3GPD) Stenner Peristaltic Pump
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  5. Back To Top    #5

    Join Date
    Jul 2011
    Location
    Indianapolis
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    Re: What am I fighting?

    Quote Originally Posted by Bama Rambler
    It's more common to have no CC's even with algae than it is to have them.
    Awesome info. Definitely didn't know that and believed the opposite. Thanks!
    19000 gallon IG installed in 2003, owned by me since 2010, vinyl liner, 18x36, Sta-Rite PLM-150 cartridge filter, 1hp AOSmith motor on <brand unknown> pump, automatic cover, BBB since August 2011

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