Improving water security with blue, green, and gray water Source - SciencE daily http://www.sciencedaily.com/releases/2013/10/131003111119.htm Published on May 16, 2014 19:02 by Sachi KhannaImproving water security with blue, green, and gray water Source - SciencE daily http://www.sciencedaily.com/releases/2013/10/131003111119.htm