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Latest Breaking News On - David manz - Page 1 : comparemela.com
Sand, gravel and Calgary know-how bring clean water to developing countries
The technology of sand filtration was developed for households by University of Calgary engineering professor David Manz
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Calgary non-profit brings purified water to developing countries
The technology of sand filtration was developed for households by University of Calgary engineering professor David Manz
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Biosand Filter, Calgary invention, turns 30
The Biosand Filter is celebrating thirty years of providing clean drinking water to communities in the developing world.
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Calgary-based biosand filter organization celebrating 30 years of providing clean water
The Centre for Affordable Water and Sanitation Technology (CAWST) has 1.7 million of its biosand filters in communities all over the world.
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City of Moscow announces fall burning season
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