Become a TFP Supporter Pool Math Forum Rules Pool School
Results 1 to 3 of 3

Thread: Does orthotolidine test include Combined Chlorine?

  1. Back To Top    #1
    Ronald U.'s Avatar
    Join Date
    May 2015
    Location
    Pearland, Texas (near Houston)
    Posts
    83

    Does orthotolidine test include Combined Chlorine?

    Am I understanding correctly that Orthotolidine colorometric test gives me Total Chlorine (FC + CC)? That would explain this morning's results:
    Ortho. Chlorine Test 3.5
    FC 2.0
    CC 1.0
    TA 90
    CH 300
    Borate 40
    CYA 40
    Thank you. Regards.
    In-ground gunnite, 24k gal., Hayward DE filter, bleach, borate, Hayward Tiger Shark robotic cleaner, 75% full sun

  2. Back To Top    #2
    JoyfulNoise's Avatar
    Join Date
    May 2015
    Location
    Tucson, AZ
    Posts
    11,604

    Re: Does orthotolidine test include Combined Chlorine?

    The OTO test typically develops its full color over time. The initial color you'll see is FC and then it darkens to give you TC. I don't use the OTO chemistry because I have never gotten accurate results from it. It's best to think about it as a "presence of chlorine" test than any kind of accurate measure.
    Matt
    16k IG PebbleTec pool, 650gal spa, spillway and waterfall, 3HP IntelliFlo VS / 1.5HP WhisperFlo, Pentair QuadDE-100 filter, IC40 SWCG, MasterTemp 400k BTU/hr NG heater, KreepyKrauly suction-side cleaner Dolphin S300i robot, EasyTouch controls, city water, K-1001, K-2006 and K-1766 test kits, Mannitol test for borates

  3. Back To Top    #3
    Ronald U.'s Avatar
    Join Date
    May 2015
    Location
    Pearland, Texas (near Houston)
    Posts
    83

    Re: Does orthotolidine test include Combined Chlorine?

    Thank you, sir.
    In-ground gunnite, 24k gal., Hayward DE filter, bleach, borate, Hayward Tiger Shark robotic cleaner, 75% full sun

Posting Permissions

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