Biblio

B. J. Lloyd, Clarke, B. A., Crompton, J. L., and Major, I. P., “Cleaning of upflow gravel prefilters in multistage filtration water treatment plants”, in Advances in slow sand and alternative biological filtration, 1996, pp. P. 391-401 : 10 fig., 1 tab.

B. J. Lloyd, Clarke, B. A., Jones, C. J., and Evans, H. L., “Water treatment by multistage filtration utilising gravel prefilters and fabric enhanced slow sand filters”, in Advances in slow sand and alternative biological filtration, 1996, pp. P. 313-326 : 12 fig., 2 tab.

B. J. Lloyd, Visscher, J. T., and G. C., G., “Overcoming water quality limitations with the multi-barrier concept : a case study from Colombia”, in Slow sand filtration : an international compilation of recent scientific and operational developments, 1994, pp. P. 47-60: fig., 3 tab.

B. J. Lloyd, Wheeler, D., Pardon, M., and Symonds, C. N., “Aspects of prefiltration concerned with the application of small scale slow sand filtration in rural communities”. University of Surrey, Department of Microbiology, Guildford, UK, p. 112 p.: fig., tab., photogr., 1985.