That's a pretty neat process for making small amounts of charcoal, not something I would have thought of.
You said that you use it as a filter medium for your aquaponics? I'd be interested to know what that's all about. I've been experimenting with aquaponics for the last 5 or 6 years, and I can always use more ideas on that. Perhaps you could do a post about it sometime.
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Thanks, I've been using small amounts of charcoal in the media beds to help eliminate algal bloom problems that I've had in the past. It also has helped a lot with water clarity and nitrogen spikes. I'll try to get a post up about it in a couple weeks when hopefully I'll have my greenhouse cleaned up.