This film shows the humus toilet in Declan Kennedy’s house. It demonstrates the development from a composting to a fermenting toilet. The final product is Terra Preta (the black earth of the Amazons). The difference of the two methods (composting and fermenting) is minimum, at first glance, but is significant in the detailed approach.

Declan and Jörn want to see the toilet as part of the natural cycle of human wastes to producing food.