Here's a partially finished project that might give some ideas for a screening device...
http://www.arkiegold.com/MultiMeshClassifier.html
The major thing I'm looking at as keeping from having 100% pure castings is the hair content of wastewater sludge in my pilot program. Not sure the worms will be able to handle it any if at all but surely gardeners will know hair is a good addition to the soil!
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