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− | '''A series of videos created to show, step-by-step, how to construct and install a concrete biosand filter: https://washresources.cawst.org/fr/collections/714c93ae/how-to-build-a-biosand-filter-video-collection''' | + | '''A series of videos created to show, step-by-step, how to construct and install a concrete-lined biosand filter: https://washresources.cawst.org/fr/collections/714c93ae/how-to-build-a-biosand-filter-video-collection''' |
A series of videos created to show, step-by-step, how to construct and install a concrete-lined biosand filter: https://washresources.cawst.org/fr/collections/714c93ae/how-to-build-a-biosand-filter-video-collection
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