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Thread: FC goes UP overnight??

  1. Back To Top    #1

    Join Date
    May 2012
    Location
    Pennsylvania
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    FC goes UP overnight??

    so ive been battling a little algae problem and while i think i have it on the run, something odd has happened, my FC went from 10.5 overnight to 12.5 this morning. Now of course there could be user error but I doubt i could have mis-counted 4 whole drops. ANyone ever hear of this? my water is clear but i am suspicious as to being algae free. thanks all
    27' above ground
    voyager cartridge
    2.25 hp hayward pump 2 speed

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    Mod Squad Bama Rambler's Avatar
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    Re: FC goes UP overnight??

    How and when are you adding chlorine in relation to the testing?
    Is the pump running between the time you add the FC and the time you test it?
    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
    Pool School ----- Pool Math ----- TF-Test Kit

  3. Back To Top    #3

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    Re: FC goes UP overnight??

    Normally I add CL in the am. On this occasion I had a bag of super shock laying around and was out if Clorox so i added that bag Wednesday evening. Nothing added since that time. Tested thurs evening about 9pm and then just now at 7 am. Filter was cleaned Sunday and has been running 24/7 on low.
    27' above ground
    voyager cartridge
    2.25 hp hayward pump 2 speed

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    Clearwater, FL.
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    Re: FC goes UP overnight??

    One thing I'm thinking...are you sure you added enough powder when you performed the 1st chlorine test?
    If you didn't get that very pronounced red at the start, you might have gotten a weak reading.

    Chuck
    Swim n Play 21' round, expandable 72" liner, 6FT deep center, buried 14", 12,750 Gallons
    Waterway 1HP-2 speed with 22" Sand filter
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  5. Back To Top    #5
    Mod Squad Bama Rambler's Avatar
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    Re: FC goes UP overnight??

    You haven't added any FC since Wednesday?
    Do you have a swg?
    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
    Pool School ----- Pool Math ----- TF-Test Kit

  6. Back To Top    #6

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    May 2012
    Location
    Pennsylvania
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    Re: FC goes UP overnight??

    Quote Originally Posted by supertune
    One thing I'm thinking...are you sure you added enough powder when you performed the 1st chlorine test?
    If you didn't get that very pronounced red at the start, you might have gotten a weak reading.

    Chuck
    good point, i believe i am, the spoon is heaping and the powder comes back up the handle about 1/8"
    27' above ground
    voyager cartridge
    2.25 hp hayward pump 2 speed

  7. Back To Top    #7

    Join Date
    May 2012
    Location
    Pennsylvania
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    Re: FC goes UP overnight??

    Quote Originally Posted by Bama Rambler
    You haven't added any FC since Wednesday?
    Do you have a swg?
    no SWG.


    no i havent. i added the super shock wednesday night. i had passed the OLCT tues. into wednesday, clear water, CC 0.0 and losing .5 FC so i thought i was good to go, and may be but after reading the volume of algae horror stories i felt it prudent to continue to be sure.
    27' above ground
    voyager cartridge
    2.25 hp hayward pump 2 speed

  8. Back To Top    #8

    Join Date
    Jul 2012
    Location
    Dumfries & Galloway, Scotland
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    296

    Re: FC goes UP overnight??

    Do you test in the same spot each time? Where did you put the chlorine in via (water, skimmer, etc)

    Few thoughts are
    1. Might of took a while for the chlorine to dissolve
    2. Different areas of the pool have variations in chemistry due to circulation
    3. You may just have made a mistake when testing

    In any context, it's not really worrying about too much!

    Regards
    Stuart
    Stuart Murray
    Scotland UK
    UK NPPOC

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