Introduction to the Bio-Sand Water Filter
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Views: 31,459
From: Timothy Stewart
Added: 17 years ago · 5:11 · 480p
An overview of the biosand filter and how Impact Nations is using it to rescue lives.
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Years
Years
Views: 31,459
From: Timothy Stewart
Added: 17 years ago · 5:11 · 480p
An overview of the biosand filter and how Impact Nations is using it to rescue lives.
No comments yet.