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?