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An Arborloo is a simple and ecological type of dry toilet consisting of a: * Pit * Concrete slab * Superstructure (toilet house) to provide privacy * Ring beam to protect the pit (optional) The concept of the arborloo toilet is to collect feces in a pit, and subsequently to grow a tree such as a fruiting tree in this very fertile soil. The arborloo works by temporarily putting the slab and superstructure above a shallow pit while this pit fills. When the pit is nearly full (3/4), the superstructure and slab is moved to a newly dug pit and the old pit is covered with the earth got by digging the new pit and left to compost. The old site uses a bed for fruit tree or other, which is preferably planted during the rainy season. The arborloo can be considered a simple form of composting toilet. In using the nutrient rich soil of a retired pit the arborloo in effect treats feces as a resource rather than a waste product. In this the arborloo both addresses issues with sanitation and provide increase crop output. ==Design== The defecation pit may be circular or square and this may depend on the slab and superstructe. A circular pit is less likely to collapse. The pit of the arborloo is shallow (between 1-1.5 meter). If the pit is dug by hand it must have a diameter/width of at least 0.9 meters to accommodate effective digging. The pit should not be wider than the slab and must allow for 0.1 meter bearing around the edge.〔 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Arborloo」の詳細全文を読む スポンサード リンク
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