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===Sustainable sanitation===
[[Image:ecosan toilets.png|thumb|right|200px|Two double-vault [http://www.susanasswm.orginfo/docs_ccbksites/susana_downloaddefault/2-50-rural-community-and-school-udd-toilets-in-misamisfiles/reference_attachments/SAYRE%202009%20Rural%20Community%20and%20School%20UDDT%20Misamis%20Oriental.pdfecosan pdf UDD toilets] in Sinalac Elementary School in Initao Municipality – one for boys, one for
girls. The school has 230 pupils; it also has 2 conventional toilets, being pour-flush with pit (photo: E. Sayre, Feb. 2008).]]
The main objective of a sanitation system is to protect and promote human health by providing a clean environment and breaking the cycle of disease. In order to be sustainable, a sanitation system has to be not only economically viable, socially acceptable, and technically and institutionally appropriate, it should also protect the environment and the natural resources.
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