David de Porta in Boston is one of the main researchers, you can get his book and find his address. Most systems independent of design seem to work when an attentive enthusiast has controls of the process and adds additional material when necessary. This could be food scraps from the kitchen or wood products and leaves from the garden. Many small changes like moisture overflow, and heat addition helps the breakdown process from going anaerobic. I have used the toilet output material in the garden on fruit trees and have had no difficulties.
Flies seem to be the main issue after moisture overload.
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