Woven fibers (e.g. linen, cotton, and other cloths)
are widely used for POU water treatment because of
their low cost and simplicity. One method used by
women in the Indian subcontinent, known as sari
filtration, involves using garment cloth folded 4
to 8 times to filter solid particles and
microorganisms from water.
Sari filters are usually effective for removing
solid particles and microorganisms that are larger
than 20 micrometers, including free-swimming
pathogen larvae, guinea worm larvae within
crustacean hosts, bacteria with large copepods, and
zooplankton, including those harboring V. cholerae.
A study of quadruplefolded saris found that 99
percent of V. Cholerae was removed from water.
These filters do not remove chemical contaminants
or dissolved compounds from water. Additionally,
studies have found that a sari’s fibers loosen
significantly the more they are used, increasing
their pore size and making them less effective.
Ease of Use
Fiber filtration involves placing the filter over
the opening of a water vessel and pouring the
contaminated water through.