Pitch a few buckets of wood chips though it AFTER every biochar crush.
EVERY.
Ask me how I know.
I just opened it up and scraped out the sludge, but putting some chips through is a good idea.
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If you have that much sludge the char is also too wet. Give it another day to dry. Tera Preta is not built in a day.
No it worked out pretty well, prefer that to a lot of dust.