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Large Poster of Biosand Filter - Version 9

This large poster of a Version 9 biosand filter (cross-section) can be printed for a training session or community event. *Note: This resources is for projects implementing the older Version 9 filters.

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About CAWST

CAWST is a Canadian charity and licensed engineering firm. We address the global need for safe drinking water and sanitation by building local knowledge and skills on household solutions people can implement themselves.