The residents of the 40 floors of San Francisco apartments above our heads may live in luxury, but really, they’re just like the rest of us: showering, washing their hands, doing laundry. Normally in the US, all their water would flush out to a treatment facility, and eventually out to a body of water; 34 billion gallons of wastewater is processed this way across the country every day. But with multiple problems for cities now converging—extreme heat, water shortages, and rapid population growth—increasingly scientists are finding clever ways to extract more use from water that’s flushed away.
In this basement, a company called Epic Cleantec intercepts the building’s gray water
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