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Thread: What is this chlorine test called?

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    What is this chlorine test called?

    What is the chlorine test called using the Basic test kit K-1000 that comes with the TF-100 test kit? Is that FC?
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    jcowart's Avatar
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    Re: What is this chlorine test called?

    That is the OTO test. Yellow test up to 5 ppm total chlorine. It's a down and dirty do I have some form of chlorine test.
    17500 gallon Doughboy AGP, Hayward DE filter, waiting for the 1.5hp DB pump to go out.
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    Re: What is this chlorine test called?

    Yup. It is a fool proof way to see if there is chlorine in the pool. It also does not bleach out at high FC levels like the pink DPD test.
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    Re: What is this chlorine test called?

    Thank you. What does OTO stand for?
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    Re: What is this chlorine test called?

    I believe that OTO test measures Total Chlorine (TC) which is the sum of Free Chlorine (FC) and Combined Chlorine (CC).
    21K gal 16' x 40' in-ground pool built 1959, old school with Jacuzzi bronze pump, American Products 24" Sand Filter & Americana Multiport valve, Jandy Lite2 millivolt heater, Coverstar cover, and classic Kreepy Krauly.

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    Re: What is this chlorine test called?

    Quote Originally Posted by Bloomfield
    What does OTO stand for?
    It's short for the name of the chemical dye. The names are as follows:

    OTO - Orthotolidine - in R-0600 Taylor reagent indicator dye
    DPD - N,N-diethyl-p-phenylenediamine - [EDIT] R-0870 Taylor indicator dye powder in the K-2006 or R-0002 liquid in the K-2005 [END-EDIT]
    FAS - Ferrous Ammonium Sulfate - R-0871 Taylor titrating reagent
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    jcowart's Avatar
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    Re: What is this chlorine test called?

    Quote Originally Posted by Bloomfield
    Thank you. What does OTO stand for?
    Orthotolidine
    17500 gallon Doughboy AGP, Hayward DE filter, waiting for the 1.5hp DB pump to go out.
    Learn to take the advice here and be trouble free or use the pool store's advice. "You can't do both and get very far"

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    Charlie_R's Avatar
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    Re: What is this chlorine test called?

    Quote Originally Posted by chem geek
    Quote Originally Posted by Bloomfield
    What does OTO stand for?
    It's short for the name of the chemical dye. The names are as follows:

    OTO - Orthotolidine - in R-0600 Taylor reagent indicator dye
    DPD - N,N-diethyl-p-phenylenediamine - R-0003 Taylor indicator dye
    FAS - Ferrous Ammonium Sulfate - R-0871 Taylor titrating reagent
    Color me wrong then. I was thinking the DPD was the powdered Taylor R-0870.
    15'x48" 4500 gallon Intex pool, buried 1.5 ft. Pac-Fab Dynamo 3/4 hp pump. Hayward S180T sand filter, bought used. Taylor K-2006 test kit. Rocket mass heater based wood fired pool heater.

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    Re: What is this chlorine test called?

    [quote=Charlie_R]
    Quote Originally Posted by "chem geek":hor6s0ek
    Quote Originally Posted by Bloomfield
    What does OTO stand for?
    It's short for the name of the chemical dye. The names are as follows:

    OTO - Orthotolidine - in R-0600 Taylor reagent indicator dye
    DPD - N,N-diethyl-p-phenylenediamine - R-0003 Taylor indicator dye
    FAS - Ferrous Ammonium Sulfate - R-0871 Taylor titrating reagent
    Color me wrong then. I was thinking the DPD was the powdered Taylor R-0870.[/quote:hor6s0ek]

    It is. He is just talking about the indicator dyes and Titrant.
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    Re: What is this chlorine test called?

    No, I was wrong. The R-0003 is potassium iodide for the Combined Chlorine (CC) part of the test. The DPD is powder in the R-0870 of the K-2006 or is in the R-0002 of the K-2005. I've corrected my post above.
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