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How sand and gravel can clean your drinking water

last year|0 view
The system follows a four-step water filtration process -- predation, adsorption, mechanical trapping and natural die-off. Shivani Kumar, India representative of South Asia Pure Water Initiative Inc (Sapwii), has come to India to conduct training workshops to convince not-for-profits and government officials to adopt the BioSand Filter method for cleaning water.