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Minn. firm's new water filter: bacteria

A rural Minnesota water company is experimenting with a new way of treating drinking water -- using bacteria to remove the harmful pollutants.

The Lincoln Pipestone Rural Water System has been using expensive reverse osmosis to clean nitrates and nitrites from its well water. But bacteria occur naturally in the water and when they're given extra food, they turn contaminants into harmless nitrogen gas, said Mark Johnson, CEO of the Lake Benton-based utility.
 
 

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