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Thread: black gunk in speedstir beaker

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    black gunk in speedstir beaker

    hey everyone, thanks in advance for your help (again!)!

    so i've been using the tftest 100 with a speedstir for the last several weeks. about a week ago, i noticed black stuff in the test cylinder i use for chlorine. it looks like mold or something on it. i didn't worry about it.

    but now it's gotten harder to see the results of chlorine tests, almost like the pink tinge never completely goes away. but i put more drops in and it never gets clearer...everything just seems kind of gray. so i try to clean the cylinder.

    so that stuff, i can't really wipe it off. and then why i try to wash it off with soap, it really starts smearing, like it's grease. so i try to bleach it off, and that doesn't seem to help. the speedstir pellet/capsule thing had a bunch on it, but i cleaned it almost totally off, just wiping.

    so then i use a clean cylinder with the speedstir, and i swear after it spins a while, it looks like there is more gunk on the new cylinder than was on the outside of the pellet.

    so i'm just wondering, is there anything in this pellet that could leak out? or if this is just some kind of mold, will it affect the tests?

    thanks!
    17k g IG vinyl pool, hayward c3030 cart filter (325 sqft), hayward tristar 3207ee 3/4 HP pump, pentair intellichlor IC20 SWG, aquacomfort act1100 heat pump

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    Mod Squad YippeeSkippy's Avatar
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    Re: black gunk in speedstir beaker

    I had that happen earlier this year and just used a very small bit of MA to fill inside of the tube with the bean in it, pouring the MA into the pool and rinsing it out good. It just seemed like the DPD powder was adhearing to the bottom, but the testing was still accurate.

    These days when I test I grab a paper towel and use it during testing and then use it to dry out the tube after use.
    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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    Re: black gunk in speedstir beaker

    thanks for the response. i think you're right about the DPD powder. i got things very clean and tried the test again and had black smears everywhere.

    and as for the test itself, i could never get the water sample totally clear. it always stayed a slightly pinkish gray. Now as i added drops, the color would lighten to a point, but then never completely clear. and the reading at the lightest point matched my taylor test kit...so i think the chems are working, just so messy that it's hard to read (or trust the results).

    i'm just going to throw out these reagents and buy some more...and keep the new ones in the house. i think the heat/humidity is what messed things up.

    thanks!
    17k g IG vinyl pool, hayward c3030 cart filter (325 sqft), hayward tristar 3207ee 3/4 HP pump, pentair intellichlor IC20 SWG, aquacomfort act1100 heat pump

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    TFP Guide


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    Re: black gunk in speedstir beaker

    i'm just going to throw out these reagents and buy some more...and keep the new ones in the house. i think the heat/humidity is what messed things up.
    Always best to keep the test kit in a climate controlled environment. It will definitely help keep the reagents fresher longer. My kit is in the laundry room cabinet. While it may be a little more humid in there than the rest of the house - humidity is a relative thing here in AZ - it is cool in there. Presently the inside humidity is about 20% - only 11% outside.

    LOL - I guess humidity is a relative thing everywhere.
    Gene
    ​12,300 gal IG play pool - Pebbletec - built 10/1999 || Hayward S360SX 36" sand filter || Hayward Ecostar SP3400 VSP || A&A In-Floor cleaning system || Quik Water Leveler || Quik Dek-clor (limited use)
    TF-100 testkit / Speedstir - A good test kit is not an expense, it's an investment

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    Re: black gunk in speedstir beaker

    we cleaned our Chlorine cylinder out pretty well tearing off a corner of a Mr Clean Magic Eraser and rubbing it around inside
    Phil
    ~9600 gal gunite pool, NEW July 2015; Pentair Intelliflo 2 VST pump; Pentair C&C 150 filter; Pentair Intelliclor IC40 swg; solar heat w/ Pentair Solartouch controller, screened. Taylor K 2005 test kit, FAS-DPD separate test, Taylor K1766 salt test

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    Re: black gunk in speedstir beaker

    68% humidity in Katy TX, 92F.
    In ground, 14,000 gallon, white plaster, unheated, stone waterfall, DE Filter, Rainbow 320 Cl, Polaris 3900, FloVis flow meter, F100 test kit, Circupool RJ30+ SWG, Circupool VJ1/Speck Badu EcoM3V variable speed pump.

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    Chasmengr's Avatar
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    Re: black gunk in speedstir beaker

    Quote Originally Posted by proavia View Post
    . . . LOL - I guess humidity is a relative thing everywhere.
    AND

    Quote Originally Posted by WASP View Post
    68% humidity in [Omaha, NHE], 92F.
    LOL x2
    Chas & Cheryl (first-time, second-year pool owners)
    Radiant Metric Oval AGP 16'x32'x52"; Pentair: Clean&Clear 150 Cartridge, OptiFlo 1.5 Hp 2-spd, and 320C Feeder (all mounted below water level); Taylor K-2006 & SpeedStir; Maytronics Dolphin E10 (aka Einstein)
    installation pics (2015-2016)

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