Perspectives are different frameworks from which to explore the knowledge around sustainable sanitation and water management. Perspectives are like filters: they compile and structure the information that relate to a given focus theme, region or context. This allows you to quickly navigate to the content of your particular interest while promoting the holistic understanding of sustainable sanitation and water management.
This factsheet describes natural water purification by ecosystems. How to maintain the service of purification by conservation or restoration of the ecosystem is also briefly discussed.
ESA (2012): Water Purification: An Essential Ecosystem Service . [Accessed: 03.02.2012] PDF