i noticed one of the things thats happened over time with me, and i only mix up 2.5L at a time, is that there's this light brown slimy stuff that sort of eventually shows up in the bottom of my dosing container, so not entirely sure what's happening in there. It's nothing crazy and my tests are still accurate.
Thanks for taking the time for your feed back.
I'm half way thru a one gallon reagent mix, but have not seen any slime.
So far all testing measurements are still spot on.