Quotes from a research on Filtering out Cholera by using simple cloth filter

"They found that an old sari cloth, folded at least four times, was as successful as specially designed nylon filters at removing plankton from water."

"Villages trained to use sari cloth experienced about half the historic average of new cholera cases.

The nylon filter produced marginally less impressive results.

The researchers say that not only does the use of old sari cloth, and similar fabrics worn in other parts of the world, appear to be an effective way to combat cholera, the material is cheap and convenient to obtain."

from : http://news.bbc.co.uk/2/hi/health/2640307.stm