TWT (n.y): Components of an Open Rapid Sand Filter. The Water Treatments (TWT) URL [Accessed: 21.02.2012]
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.