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The material on this page was adapted from: Tilley, E. et al. (2008). [http://www.eawag.ch/organisation/abteilungen/sandec/publikationen/publications_sesp/downloads_sesp/compendium_fr compendium_high.pdf Compendium des Systèmes et of Sanitation Systems and Technologies d'Assainissement], published by [http://www.eawag.ch/organisation/abteilungen/sandec/index_EN Sandec], the Department of Water and Sanitation in Developing Countries of [http://www.eawag.ch/index_EN Eawag], the Swiss Federal Institute of Aquatic Science and Technology, Dübendorf, Switzerland. The publication is available in English, French, and will be made available in Spanish. [http://www.irc.nl/docsearch/title/163208 Available in the IRC Digital Library]