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.
The object of this volume is to discuss the various aspects of one particular form of water treatment - the "biological filtration" or "slow sand filtration" process. This system of water purification has been in continuous use since the beginning of the nineteenth century, and has proved effective under widely differing circumstances.
HUISMAN, L. WOOD, W.E. (1974): Slow Sand Filtration. Geneva: World Health Organisation (WHO) URL [Accessed: 06.02.2012]