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Thread: powder for chlorine testing TF100

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    jccams's Avatar
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    powder for chlorine testing TF100

    Twice today I have added the scoop of powder to the 10ml of pool water to perform the chlorine drop test and it has not changed color. I went and got a new sample the first time and a scoop changed color. The second time a new sample did not change anything so I added a second scoop and it changed. I know there is high levels of chlorine in the sample as I am currently shocking. Any idea what is going on and is adding a second scoop theright thing to do?
    24,000 gal vinyl Lazy L, 1 hp pump, DE Filter, Pentair 250K heater, Letro Legend pressure side pool sweep

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    whoozer's Avatar
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    Re: powder for chlorine testing TF100

    Possibly your single scoop wasn't large enough to make the color change. Some suggestions say two level scoops and some say one big heaping scoop. So if the 2 level scoops caused it to change color to pink just do it that way from now on.
    14x33 fiberglass freeform
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    Mod Squad Bama Rambler's Avatar
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    Re: powder for chlorine testing TF100

    how high was the FC after the second scoop was added?

    I usually add two level scoops instead of the one heaping scoop. As long as you get enough powder you're ok. A little too much isn't going to hurt.
    Dave J. TFP Moderator
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    JasonLion's Avatar
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    Re: powder for chlorine testing TF100

    When you add the R-0870 powder and the sample changes color for a moment and then goes back to clear, you should add another scoop of R-0870. The higher the FC level, the more R-0870 powder you tend to need. At extremely high FC levels you might need several scoops.

    The sample will stay clear if there isn't any chlorine in the water. Sometimes this can get a little confusing, it isn't always obvious if the FC level is zero or very high. If you have any concerns, you can use the OTO chlorine test in the K-1000 (where the PH test is). The OTO chlorine test is the most reliable chlorine/no chlorine test. It will change color if there is any chlorine and only stay clear if there is no chlorine.
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    jccams's Avatar
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    Re: powder for chlorine testing TF100

    Last test came back FC 28 CC .5, this was after 2 scoops of powder. Added bleach to return to FC 31 will test in about 3 hours. Can't wait for this to end. Thanks everyone for all the help.
    24,000 gal vinyl Lazy L, 1 hp pump, DE Filter, Pentair 250K heater, Letro Legend pressure side pool sweep

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