Sustainable sanitation also includes the reuse of grey-water. Grey-water is identified as the waste water generated in households, excluding the water containing human excreta or urine, but including water from kitchens, bathrooms and washing rooms. Such water can be used as source for additional supplies of water available for irrigation and it often contains the necessary nutrients. In dry regions of the world such waste water is very important, thus treated waste water is already being used for crop production in most peri-urban areas of the developing world.
last date 30th June 2007