I'm also seeing some issues with brown mucky gook coating some off the roots and eventually suffocating them and causing pyth to start..... I believe this is whatever is not soluble in the mycogrow soluble since it forms a thick black paste in the bottom of the bucket if you don't stir/agitate the tea before use and when I pulled some roots off the gook had a metallic sheen to it just like the mycogrow has....I am wondering why we are not supposed to filter smaller than 400 microns. In the bacteria/fungal spore world that's HUGE. Subtilis is only 10 microns at its largest, trich spores are under one micron. A lot of people on here use coffee filters which are about 20 microns and seem to be doing fine...400 Microns just seems huge. I began using the tea with a 20 micron bubble bag for a filter and had nice clear honey tinted tea that didn't gook up the roots, but then I read all the posts here screaming at people for using coffee filters saying they are filtering out all the "good stuff" so I switched to a 400 micron filter sock made for filtering biodiesel, but then I poured that tea into the rez it was horribly dirty and all the roots were just coated thick, not sure why heis and others don't have this problem. I read up about as many bacteria and fungus sizes I could find and found that there is nothing that I can see in the list of the ingredients we use that would be filtered out with a 20 micron filter except a few bacteria that get close to the 40 micron size but they seem unimportant. After reading all that I settled on a 140 micron filter bag for now which still leaves the tea cloudy and still coats my roots with brown gunk but it's manageable for now.
I have three 100 gallon systems going, two are going alright with the tea, growth seems slower than when chlorine used to work before I got slimed, and pH needs to be adjusted down daily, but everything is ALIVE and GROWING which is all I care about at this point after not having a harvest in over 6 months due to slime over and over. The third system was one that already had the slime, the first two res changed with tea made them start to recover and grow new roots, but for some reason a day after the third res change they super slimed and died overnight like there was no tea at all. I know it wasn't the tea itself because I used the same batch on the other two systems that are still fine. My guess is that since the first two good systems started with non-slimed plants they had a head start and never had to compete with the slime very much...the third system was slimed/roots trimmed/slimed again/roots trimmed and tea applied, started growing, slimed again. Maybe the slime was hiding inside the rootball since it was pretty big and I didn't want to remove too much, and it bred super slime....not sure. Just glad the tea is working in my two systems that I started with tea in the first place. These systems had horrible slime issues in the past and all I did was run 15ml/gal physan20 overnight, drain, rinse with tap water, filled with RO and 1 cup/gallon tea, put plants in, waited 12 hours, added nutes.
I also wait 12 hours when I do a res change before adding nutes even on the flowering systems just in case.