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Thread: Highest FC for testing

  1. Back To Top    #1

    Join Date
    May 2009
    Location
    Sacramento CA
    Posts
    13

    Highest FC for testing

    Hi all
    Just shocked pool, how high can FC be and still have accuarate test results. I think I read its different for different tests.
    Thanks, Steve
    20K gallons,plaster, IG, Posi Flo 100 cartridge filter, 3/4hp pump. , Polaris 280?

  2. Back To Top    #2

    Join Date
    Jan 2009
    Location
    Cupertino, CA
    Posts
    1,966

    Re: Highest FC for testing

    Depends on the type of test. The OTO test (drops that turn yellow) generally comes with a color block that goes up to 5; you can dilute your sample half-and-half with chlorine-free water to double the range. The DPD test (drops that turn red) I think works the same way, range-wise; although it tends to "bleach out" at high FC levels (incorrectly reads very low). The FAS-DPD test (powder that turns the water pink, with drops that make the color go away) is supposed to work up to 50ppm.
    --paulr
    BBB "Intermediate Swimmer"
    IG plaster pool 18.5K gal, Hayward Pro-Grid DE filter, 3/4 HP Hydramax II; Polaris 380, 3/4 HP booster
    AG spa 325 gal, probably Sundance of some kind
    Water testing instructions on one page

  3. Back To Top    #3

    Join Date
    May 2009
    Location
    Sacramento CA
    Posts
    13

    Re: Highest FC for testing

    Hi again,
    What I ment to say was Id like to run all the tests. Will different tests require different FC levels.
    Thanks,Steve
    20K gallons,plaster, IG, Posi Flo 100 cartridge filter, 3/4hp pump. , Polaris 280?

  4. Back To Top    #4

    Join Date
    Jan 2009
    Location
    Cupertino, CA
    Posts
    1,966

    Re: Highest FC for testing

    Ah, okay... the pH test starts being unreliable at FC > 10; I hear that high FC can also cause the, uh, I think it's the TA test to turn unusual colors, but if you're just looking for the color to start and stop changing, the exact color isn't important. I don't think anything else cares about FC level.
    --paulr
    BBB "Intermediate Swimmer"
    IG plaster pool 18.5K gal, Hayward Pro-Grid DE filter, 3/4 HP Hydramax II; Polaris 380, 3/4 HP booster
    AG spa 325 gal, probably Sundance of some kind
    Water testing instructions on one page

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