Africa
In Zimbabwe, there has been much experimentation in the past few years with Ecological Sanitation.28 It is now spreading to peri-urban areas, with various toilets designed for different purposes being tried. In addition to urine-diverting toilets, other ecologically sound toilet systems are also being used. The ‘arborloo’ is a system in which both urine and faeces are deposited in a shallow pit. When it is nearly full, it is topped off with soil and allowed to digest and decompose for several months. At that time, trees are planted in the topsoil. Preliminary experimentation has shown that fruit trees and trees raised for firewood grow well. Early experimentation with growing food is also positive with yields enhanced.