SHENKUT, M., 1999. Multi-stage filtration in water treatment. IN: Pickford, J. (ed). Integrated development for water supply and sanitation: Proceedings of the 25th WEDC International Conference, Addis Ababa, Ethiopia, 30 August-2 September 1999, pp.298-301.
Sixty per cent of the world population do not have access to safe water and only 25 per cent enjoy adequate
sanitation facilities. In Ethiopia, it is only 25 per cent of the population with access to poorly maintained water supply systems and the sanitation coverage is less than 7 per cent.
The combined effect of poor water supply provision and virtually non-existent sanitation facilities account for over 75 per cent of the diseases in the country.