Changes

[[Image:straining icon.png|right]]

[[Image:straining with cloth.jpg|thumb|right|250px|A woman uses a sari cloth to strain water. Photo: CAWST.]]

The pore size range in old (laundered) sari cloth is 100–150 μm, but about 20 μm if the cloth is folded four to eight times. The holes allow water to pass but retain particles and pathogens >20 μm. Straining through sari cloth has been shown to be effective in filtering out the plankton to which cholera bacteria may attach themselves, therefore reducing the risk of cholera. This simple method can also filter out many helminths and their eggs and larvae.