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There is now clear evidence that simple, low-cost water treatments can greatly improve the quality of household stored water and reduce the risks of diseases that cause diarrhea and death.
Biosand water filters use sand and gravel (found locally) in a slow filtration process that treats polluted water.
For General Audiences
Biosand filters A Guide for Grass Roots Audiences: This module provides an overview of biosand filters and explains how they can be used to provide safe drinking water.