Video

Wash Separation and Drainage Gravel for the Biosand Filter (BSF)

Part of a video series on how to build a biosand filter (BSF). Find out how to correctly wash the separation and drainage gravel layers used when installing a BSF.

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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.