A single unit measuring 20 feet in length can purify all the water for a large hotel, he said, or a village of 200 to 1,000 people. The key is that the device operates on no, or almost no, energy. The only energy that is required is the energy to pump the water to the top of the thing. If the unit is beneath the incoming water stream, the water can flow in and purify itself through gravity.
read the full article in: Greentech Media
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