Hippo Roller' gadget providing access to clean water - YouTube
Balancing Tradeoffs: The Evolution of the Hippo Roller
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The Hippo Roller: A Water Collection Soution
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Hippo Roller
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Water Purification Design for Hippo Rollers Wins Awards - The Water Network | by AquaSPE
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How 'Hippo Roller' eased a burden and became a phenomenon
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The Hippo Water Roller Is Changing Lives in Sub-Saharan Africa
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Hippo Roller — Design Life-Cycle
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Hippo Roller: It all started with Women walking for water
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Hippo Roller - World Thirst Solutions | Drinking Water Solutions For The Developing World
Hippo Roller – empowering people. Network
