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Thread: FC loss

  1. Back To Top    #1

    Join Date
    Jun 2016
    Location
    victorville ca
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    FC loss

    9 am test results:

    FC 3
    cc 0
    ph 7.4
    TA 100
    ch 125
    cya 30

    4:45 test results:

    FC .5
    cc .5
    ph 7.4
    TA 100
    ch 125
    cya 30

    I checked overnight loss last two nights and it has been 0. How should I proceed to keep my FC levels around 4 and not get to 0 before the end of the day? Full sun, 105 temps, swimmer load (6 kids, averaging 4-6 hours a day).
    15 x 42, 4600 gal, AG summer waves, vinyl, SkimmerPlus 1000 filter pump, K-2006

  2. Back To Top    #2
    Texas Splash's Avatar
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    Re: FC loss

    As long as you are algae-free, which it sounds like you are because you passed the OCLT and have less than 0.5 CC (clear water too right?), then increase your CYA. It must be hot there in V-ville, so I would increase CYA to at least 50. But make sure to increase your FC along with it - target FC of 6 and NEVER below 4. Your FC should hold much better.

    Hope that helps.
    Pat (a.k.a. Texas Splash) ~ My Pool: Viking Fiberglass; 17,888 Gal; Waterway Supreme 2-sp/2-hp pump; Hayward Ctg filter; TF-100 w/ Speed Stir
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  3. Back To Top    #3
    Mod Squad woodyp's Avatar
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    Re: FC loss

    You may have to jack up FC 2 points above target level too. I do.
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  4. Back To Top    #4

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    Jun 2016
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    victorville ca
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    Re: FC loss

    The water gets a bit cloudy by the end of the day but is clear in the morning. I have a venturi style vac which doesn't get the fine dirt just stirs it into the water. The pump isn't greatest either but working on getting an upgrade. I will bump up my cya and fc as suggested and let you know how it turns out. Thanks!
    15 x 42, 4600 gal, AG summer waves, vinyl, SkimmerPlus 1000 filter pump, K-2006

  5. Back To Top    #5

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    Aug 2015
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    Ellis County, TX
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    Re: FC loss

    Does a CC level of 0 necessarily mean no algae is present?

  6. Back To Top    #6
    Mod Squad pooldv's Avatar
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    Re: FC loss

    No, it does not.
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  7. Back To Top    #7

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    Re: FC loss

    If you passed the OCLT on the 1st, and it is cloudy now at times, try another OCLT. Then you will know. Also, you may want to test and add at night until you get to know your pool's habits better.

  8. Back To Top    #8

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    Jun 2016
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    Re: FC loss

    I added CYA to bump it to 40 on 7/1, finally got test to read 40 on 7/3. Seemed to keep the FC loss to 2-3 a day. Yesterday kids said pool felt slimy on bottom. I decided to bump FC to 8 from 6. There isn't any cloudiness today. I did OCLT test last night. No loss of FC. So, no cc doesn't mean no algae. Is there anything else I need to look at again?

    Last night tested chlorine 1 HR after adding 14 oz 8.25% chlorine to bump from 6 to 8, results:

    FC 8
    CC .5

    This morning:

    FC 8
    CC 0
    PH 7.4
    ph 7.4
    TA 100
    ch 125
    15 x 42, 4600 gal, AG summer waves, vinyl, SkimmerPlus 1000 filter pump, K-2006

  9. Back To Top    #9
    Mod Squad pooldv's Avatar
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    Re: FC loss

    If your daily FC usage seems higher than normal or you suspect algae then you can do the Overnight Chlorine Loss Test to see if there is something cooking in there.
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  10. Back To Top    #10

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    Re: FC loss

    Is the bottom still "slimy"?

  11. Back To Top    #11

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    Jun 2016
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    Re: FC loss

    There seems to be a spot or two. I scrubbed them up. I will do another OCLT again tonight but last night there was no FC loss and no CC with this mornings test.
    15 x 42, 4600 gal, AG summer waves, vinyl, SkimmerPlus 1000 filter pump, K-2006

  12. Back To Top    #12

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    Re: FC loss

    "Slimy" is a very good indicator of nascent algae.

    Glad you brushed and are doing another OCLT. Good luck!!!!

  13. Back To Top    #13

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    Jun 2016
    Location
    victorville ca
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    Re: FC loss

    Last night test chlorine only
    FC 3.5
    CC 0


    This morning:
    FC 3
    CC 0
    PH 7.8
    15 x 42, 4600 gal, AG summer waves, vinyl, SkimmerPlus 1000 filter pump, K-2006

  14. Back To Top    #14

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    Re: FC loss

    You should be good to go then!

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