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Thread: Need help using TF-100

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    Need help using TF-100

    I just got the TF-100 kit and started testing my pool that has been cloudy for several weeks. But I'm a bit confused. Per the basic test, total chlorine is above 5. When I do the Chlorine Drop test, FC and CC is 0. How can that be?

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    Charlie_R's Avatar
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    Re: Need help using TF-100

    How are you doing the DPD-FAS test?

    Check this out, and see if you get different results......extended-test-kit-directions-t25081.html
    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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    Mod Squad jblizzle's Avatar
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    Re: Need help using TF-100

    Welcome to TFP!!!

    How much water and how much powder did you use when you did the FAS-DPD test?
    Jason, TFP Moderator
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    Re: Need help using TF-100

    I followed the Chlorine Drop Test instructions in the TF-100 kit. Reading the link provided by Charlie_R, maybe I need to add another scoop of R-0870 powder. I will try that.

    Also, how do I test for CYA that's higher than 100? I can't seem to find a post on that.

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    Mod Squad YippeeSkippy's Avatar
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    Re: Need help using TF-100

    Mix equal parts of pool water with tap water (which contains no CYA). Then using that water perform the test and double the result.
    My Amazon Smile for November12K Fiberglass IG, Infinity 4000 automatic cover, SWCG, Hayward Sand Filter, Hayward 1.5 Pump, Doheny Discovery Robot, Savi Melody LED pool lights, outdoor speakers and other assorted doo-dads. Sundance Altamar Hot Tub.
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    AimeeH's Avatar
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    Re: Need help using TF-100

    Also, how do I test for CYA that's higher than 100? I can't seem to find a post on that.[/quote]

    You can combine pool water and tap water in a 50/50 mix. Add that to the proper fill level then add your reagent. Your result would then be doubled.
    18*36*23 true "L" vinyl IG 29,000 gallons. SWG. TF-100 test kit.
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    Re: Need help using TF-100

    Using 2 scoops of R-0870 did the trick. My FC is 35 and CC is 0.5. Now I have to get an accurate reading of my CYA which I know is above 100. I will do the 50/50 trick. Thanks for the help.

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    Mod Squad jblizzle's Avatar
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    Re: Need help using TF-100

    Do the 50/50 as described. If the reading is STILL near or over 100, dump out half of the mix and add more tap water, mix and retest multiplying the result by 4 ... you will lose accuracy, but should give you a little better idea.
    Jason, TFP Moderator
    18k IG pebblesheen pool, Hayward ProLogic P4 w/ T-15 SWG, Pentair 1HP 2-speed Superflo, Hayward 6020 DE filter
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    linen's Avatar
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    Re: Need help using TF-100

    Quote Originally Posted by lipool
    My FC is 35 and CC is 0.5.
    Just thought I mention:
    Quote Originally Posted by lipool
    Per the basic test, total chlorine is above 5.
    If your FC +CC is actually 35.5, the OTO should show a dark orange or brown, not yellow.
    TFP Expert who uses Pool School and my TF100 test kit along with PoolMath for my: Round 11K gallon AGP with deep end, 20" sand filter, Matrix 1hp 2spd, 6 2ftX20ft solar panels (and solar cover!), Intex SWCG (copper bars disconnected) and a Rubadub hot tub (chlorine). The SLAM process is not finished until: 1. CC < 0.5 ppm, 2. An OCLT < 1.0 ppm and, 3. The water is crystal clear.

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