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about 3 years ago

Huambo, #Angola, 2005—the first CAWST biosand filter training in #Africa. Properly running #biosand filters produce approximately 12–18 L of filtered drinking #water per hour. A life-changing invention from #Calgary, #Canada—it’s the biosand filter’s 30th birthday! #BASF30

cawst's tweet photo. Huambo, #Angola, 2005—the first CAWST biosand filter training in #Africa. Properly running #biosand filters produce approximately 12–18 L of filtered drinking #water per hour. A life-changing invention from #Calgary, #Canada—it’s the biosand filter’s 30th birthday! #BASF30 https://t.co/oPIQ9YGwWd

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Top Tweets for #BASF30

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