Leave it to the brainiacs at the renowned Palo Alto Research Center (
PARC) to devise a water filter that manages to do away with two of the technology's most vexing problems: a high energy requirement and the need to constantly replace used up membranes. Their device, called a spiral concentrator, is a 50 cm long, 1 mm in diameter piece of plastic tubing that separates particles as small as 1 micron in size by centrifugal force, reports
Technology Review's Lee Bruno. Those particles are in turn moved out of the ...
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