The single pit latrine is one of the most widely, cheapest and easiest used sanitation technologies. It is made out of a latrine superstructure, a slab and a pit. Excreta, along with anal cleansing materials (water/solids) are deposited in the pit. To avoid people falling in the pit and increase convenience and reduce odour, a slab with a hole is used to cover the pit. Lining the pit prevents it from collapsing and provides support to the superstructure but the underground of the latrine should be water pervious.