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Thread: Strange FC testing

  1. Back To Top    #1

    Join Date
    Jul 2008
    Location
    Solon, Iowa
    Posts
    170

    Strange FC testing

    OK - strange to me. While fighting a mustard algae outbreak with high chlorine shock levels (low 30's) I encountered strange behavior with the drops test. Morning test. Rinsed the vial in pool water, added 10 ml pool water, tossed in the powder, and water flashes slight pink and then returns to clear without adding any drops.

    so, I toss it out, rinse the vial, and repeat. This time, the solution turns dark pink and I proceed to record a FC level that is consistent with the bleach I added, etc (31 one morning and then 25 the next). This has happened two mornings in a row, but not for my evening tests. I rinse my vial in pool water before after each test.

    Am I doing something wrong?

    pH 7.2 - 7.3
    borates 50
    TA 130
    CYA 55
    CC 0-0.5
    15X30 AGP, Lomart beaded liner;
    1.5 HP Sta-Rite pump with 21 inch sand filter (Zeobrite media)
    Mineral Springs (Aquatrol) SWCG, Rigid PVC plumbing, 2 inch
    Four 4X12 Techno-Solis solar panels, rack mounted, Goldline Solar Controller

  2. Back To Top    #2
    reebok's Avatar
    Join Date
    Apr 2009
    Location
    Lakeland, FL
    Posts
    1,268

    Re: Strange FC testing

    when that happens just add more powder until it stays pink.
    16x32 21,000 gallon in-ground exposed aggregate, 1.5hp pump, 120 sqft catridge filter, birdcage, solar panels, aquavac tigershark qc robot.

  3. Back To Top    #3

    Join Date
    Jul 2008
    Location
    Solon, Iowa
    Posts
    170

    Re: Strange FC testing

    Duh - that makes perfect sense. Don't know why I didn't think to try it.

    Kelly
    15X30 AGP, Lomart beaded liner;
    1.5 HP Sta-Rite pump with 21 inch sand filter (Zeobrite media)
    Mineral Springs (Aquatrol) SWCG, Rigid PVC plumbing, 2 inch
    Four 4X12 Techno-Solis solar panels, rack mounted, Goldline Solar Controller

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