The homemade cloth masks that performed best in the testing with the nylon layer were all made of a tightly woven cotton, the kind used for quilting, and they all contained a filter of some kind ...

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. The scientists then tested the effectiveness of ...

The team taught one group of participants to filter drinking water using typical sari cloth folded four times and provided a second group with premade 150-micron nylon filters. A third group acted ...

The cloth filters cut cholera cases as effectively as more expensive nylon filters designed to trap worm larvae, supplied by the World Health Organization. Also encouraging, says Colwell ...