Filtering with an old sari cuts cholera cases by half.
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Colwell, R.R. et al. Reduction of cholera in Bangladesh villages by simple filtration. Proc Natl Acad Sci, Published online DOI: 10.1073/pnas.0237386100, (2003).
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Powell, K. Clothes clean drinking water. Nature (2003). https://doi.org/10.1038/news030113-2