5.6.1 Pour-flush toilets
The problems of flies and smells in latrines can be overcome by using a toilet pan with a water seal (Figures 5.15 and 5.16). The shape of the toilet pan is designed with a bend in the outlet pipe. Water remains in the bend at all times and creates a ‘water seal’. Pour-flush toilets use this system. After defecation, 1.5–2 litres of water is poured (using a small container) into the toilet pan to move the wastes along. This system is popular where people traditionally use water for anal cleansing, and where water is readily available. Pour-flush toilets can be located inside the house, since the water seal prevents bad odours and insect nuisance.


5.6 Water-flushed systems