1. Rachwal, A., Rodman, D., West, J. and Zabel, T. 1984. Uprating and Upgrading of Slow Sand Filters by Pre‐Ozonation. Paper presented at a Seminar on Ozone in UK Water Treatment Practice organized by the Institution of Water Engineers and Scientists and The Water Research Center. Sept.51984, London, England.
2. Slow Sand Filtration for Cercarial Control in North Cameroon Village Water Supply