Ethiopia: the success of the ArborLoo latrine (IRC Source) – Designed by Peter Morgan of Zimbabwe for African conditions, the ArborLoo is the simplest of all eco toilets, a revolutionary approach that views human excreta as resources to be utilized rather than waste to be avoided. A pit measuring 80 centimetres deep and 60 centimetres wide is dug, dry leaves are added to the bottom and a concrete slab is placed over the opening. After each use, a cup of soil and wood ash mixture is added to encourage composting, reduce smell, and discourage insects. A simple structure can be added on top for privacy. The toilet is used by a household for one year, after which the slab is removed, the pit is topped up with good topsoil, and a fruit tree seedling or other crop is planted in the topsoil.
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