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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_high.pdf Compendium of Sanitation Systems and Technologies]. [http://www.eawag.ch/index Eawag]: The Swiss Federal Institute of Aquatic Science and Technology, Dübendorf, Switzerland.