Composting in a Bucket. What to Do When It Gets Full.

I recently heard a talk by JZ about composting. He mentioned that we could compost in a barrel by constructing a pile according (Easy (cold)) of your Composting in the Desert booklet. We have started this by using an old plastic garbage barrel, punching holes along the bottom to allow for drainage and air inflow. We cover with plastic sheeting. Question---we are almost up to the top and have only been doing this for a couple of weeks! What do we do now?

I wanted to use one of those Juwel bins so that we could remove the compost as it forms from the bottom...do these really work this way?

Please get back to me ASAP. Thank you very much!!