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Flocculant/coagulant water purification (calcium hydroxide)
turn dirty water into clean water with flocculation or coagulation. I use a chemical called calcium hydroxide and i even show how to make […]
Michael Pritchard: How to make filthy water drinkable
http://www.ted.com Too much of the world lacks access to clean drinking water. Engineer Michael Pritchard did something about it — inventing the portable Lifesaver […]