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I am wondering if this water circulates within their datacenter going through some cooling system or they have constant stream connected to community water pipe? Can someone explain? e.g. how big might be daily consumption of this facility? is there serious "green" difference of its mostly PR trick?

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I'm not sure exactly how much water these data-centers use, but it's huge enough that Microsoft built a water treatment plant next to its DC in Quincy, WA, which it now leases back to the city for $10/year in exchange for reduced water rates. In that scenario the water is reused by treating at each stage between the fruit processors, the data center and the city.

http://blogs.technet.com/b/msdatacenters/archive/2011/10/13/...

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