This research was carried out in Matlab, Bangladesh in collaboration with the International Centre for Diarrhoeal Disease Research, Bangladesh. They found significant filtering of zooplankton (i.e. copepods) and colonial phytoplankton from household water by nylon and sari filtration, as well as reduction of cholera cases in the studied villages.
COLWELL, R.R. ; HUQ, A. ; ISLAM, M.S. ; AZIZ, K.M.A. ; YUNUS, M. ; KHAN, N.H. ; MAHMUD, A. ; SACK, R.B. ; NAIR, G.B. ; CHAKRABORTY, J. ; SACK, D.A. ; RUSSEK-COHEN, E. (2003): Reduction of cholera in Bangladeshi villages by simple filtration. In: Proceedings of the National Academy of Sciences of the United States of America (PNAS): Volume 100 , 1051-1055. URL [Accessed: 24.05.2019]