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Large Biosand Filter Puzzle - Version 9

This poster of a Version 9 biosand filter can be used as a puzzle activity in a training session or comminuty education 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.