http://blogs.ei.columbia.edu/2 ...
Published by Suresh Kumar.S
http://blogs.ei.columbia.edu/2011/04/04/from-wastewater-to-drinking-water/
From waste water to drinking water..A case from San Diego,US.
Direct and indirect potable water[use after storing in reservoir]from waste water.
Toilet to tap recycle of waste water also in California,New Mexico,and in countries like Singapore,Australia,Namibia,Spain etc