It is indeed a bucket system inside! The “Out” is by human hands, and the fact that it’s outdoors. A bucket sits under a toilet seat and gets several handfuls of wood shavings when finished with a “deposit”. When the bucket gets full there is a humanure pile - in a pallet wood box- where it gets dumped, the whole pile gets turned and the covered again. After one box is full, its turned and covered one last time and left to compost for 2 years before being used.
