Greetings,
I just wanted to chime in and report the condition of my grow. To recap, I "preveg" in hydroton, DTW. From there, they go into RDWC biobuckets. I've been fighting what I believe to be Pythium for a couple of months. I started the tea regimen about a month ago. It made a marked difference. Plants were no longer dropping dead, but still not vibrant and healthy, by any means.
I tried adding more air in the buckets, allowing the roots to "dry" a bit, raising the plants to increase air gap, lowering res. temp., etc. None of these things seemed to make much difference.
I ran across an article some time ago, about how a nonionic surfactant will destroy the zoospore stage of pythium. I was a bit scared of it, because I couldn't find the specific surfactants they used, I didn't understand the units they reported for dosage, and I didn't know how it would work with the tea. After considerable further study, I went for it about a week ago. I settled on one ounce of Wet Betty (original) in a 60 gallon system.
Wow! It may be a bit early to start ringing the bell, but in just a few days, the difference is remarkable!!! This method may not work in other systems, or battling other pathogens, but in my world, it was the straw that broke the Pythium's bubble. For my situation, the combination of tea and surfactant appears to be kicking some serious ass!
Many thanks to Mr. Heis., and all others who have contributed here. I hope that my experience will prove useful to others.
Grow well,
B.B.