Become a TFP Supporter Pool Math Forum Rules Pool School
Results 1 to 4 of 4

Thread: Conflicting TF-100 results

  1. Back To Top    #1

    Join Date
    Jul 2013
    Location
    Bahia, Brazil
    Posts
    13

    Conflicting TF-100 results

    I'm getting conflicting readings with my new TF-100 test kit.

    ph = 7.2
    TA = 80
    CYA = 70
    FC = 24
    CC = 2

    So far so good. The TC is what I expected, as I shocked two days ago to recover from algae. (And the TA sample turned to yellow instead of red, which I understand also indicates high chlorine.) The problem comes when I measure chlorine with the included Taylor K-1000 kit: 1 get a reading of only 1 (very light yellow). To double-check, I got out an older basic test kit I have, and with it I get what I would expect -- off the scale, very dark yellow/orange.

    The water is blue and clear.

    Anyone know why I get the apparently erroneous reading with the K-1000? (The kit is only about a month old.)

    Thanks!
    [Rural Brazil; 60k Ltrs; inground tile; sunny; few swimmers; no organics; non-stabilized granular; Jacuzzi pump & sand filter; homemade PVC heater]

  2. Back To Top    #2

    Join Date
    Jun 2012
    Location
    Louisville, KY
    Posts
    266

    Re: Conflicting TF-100 results

    The OTO and DPD tests react differently with high FC. One of them bleaches out quickly I can't remember which one. The only reliable test when shocking is FAS-DPD.

    DPD bleaches out at high FC. OTO does not. Read the sticky at the top of this forum on extended test directions. It's a great read any way.
    18x36 inground vinyl lined, Hayward sand filter and tablet chrolinator, approx 18k gallon

  3. Back To Top    #3

    In the Industry

    duraleigh's Avatar
    Join Date
    Apr 2007
    Location
    Sebring, Florida
    Posts
    30,078

    Re: Conflicting TF-100 results

    Anyone know why I get the apparently erroneous reading with the K-1000?
    Make sure you are using the R-0600 reagent and not the R-0003
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

  4. Back To Top    #4

    Join Date
    Jul 2013
    Location
    Bahia, Brazil
    Posts
    13

    Re: Conflicting TF-100 results

    SOMEHOW, the lookalike R-0003 bottle found its way into the K-1000 box.
    Thanks, duraleigh!
    [Rural Brazil; 60k Ltrs; inground tile; sunny; few swimmers; no organics; non-stabilized granular; Jacuzzi pump & sand filter; homemade PVC heater]

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •