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Thread: TF 100 testing questions

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    Join Date
    Jun 2016
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    TF 100 testing questions

    hello,

    rookie TF 100 testing kit user here -
    1) When using the CYA test: the instructions are to fill till you no longer see the black dot in the bottom of the tube - what if the black dot turns grey at the very top of the tube (less than 20 CYA level) ? Does the black dot need to completely disappear from black to clear? or does the change from black to grey signify the correct level?


    2) When using the chlorine drop test to get the free chloride level : when adding the R-0871 solution one drop at a time to change to color from pink to clear - how long do you wait between drops for it to stay clear? For my first test - it seemed like I was clear at 8 drops - but 30 sec later - the sample turned from clear back to a very very light shade of pink again


    thanks for your help,
    stevenpi
    18000 gallon in ground pool, vinyl liner, Foxx sand filter (new sand in 2015), challenger 3/4 hp pump, TF-100 testing

  2. Back To Top    #2

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    Mr Bruce's Avatar
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    Re: TF 100 testing questions

    1. That means you have less than 20 CYA, but probably more than 0. Yes, completely disappear. Black to cloudy is a better way to put it.

    It's best to do the CYA test in full sun, with your back to the sun, vial at waist height with two fingers. Squirt, glance, look away. Squirt, glance, look away.

    2. The initial change is the one that counts. After you go clear, either dump it or do the CC test right away. The 30 second later change doesn't mean anything.

    Great questions!
    32K gallon Plaster - 1hp Hayward 2 speed Super Pump - Hayward S200 Sand Filter - TF100XL
    Test Kits - Pool Math - Chlorine/CYA/Target/Slam Chart

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    Re: TF 100 testing questions

    Great - thanks for the help!

    Quote Originally Posted by Mr Bruce View Post
    1. That means you have less than 20 CYA, but probably more than 0. Yes, completely disappear. Black to cloudy is a better way to put it.

    It's best to do the CYA test in full sun, with your back to the sun, vial at waist height with two fingers. Squirt, glance, look away. Squirt, glance, look away.

    2. The initial change is the one that counts. After you go clear, either dump it or do the CC test right away. The 30 second later change doesn't mean anything.

    Great questions!
    18000 gallon in ground pool, vinyl liner, Foxx sand filter (new sand in 2015), challenger 3/4 hp pump, TF-100 testing

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    Mod Squad pooldv's Avatar
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    Re: TF 100 testing questions

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