Aeroponic funk?!

Been working with this homemade system for about 8 months now and several cycles and it seems that I cant get rid of this funk in the system. Ive tried using aqua shield, H202, and even collodial silver and it always seems to come back. I switch my res every week and wash it away but then it funks up with in the next week. I clean it between every veg cycles and run bleach through it and then let run with plain water to get rid of the bleach residue. I have gone through hell and high water to make this thing lightproof and my res temp usually sits around 65-68 degrees. So what the hell do I do! Thanks in advance for any input.

no comments huh?

It sounds like you're doing everything right... is there any possibility that some of your medium is flowing back into the res??? seems unlikely but idk. the only other thing I can think of is maybe stuff is falling in somehow... but idk why your res would be uncovered...

Keep in mind I'm completely guessing because I have no exp. with aeroponics.

What do your roots look like? I don't use H2O2 or any root inoculants. And what nutrients do you use? Fellow MT aero guy here to help if I can. My reservoir lasts for 3 weeks with topping it off with fresh H2O, until iI put a fourth unit into flower. Then I will change every other week.