Why don%26#039;t houses have TWO grades of water (drinking and sprinkling)? I%26#039;m always puzzled by this. We know gasoline is precious and limited, whereas water is semi-precious and reuseable. Yet it matters to save water or else in the future we may have shortages due to population growth, or global warming.

So if water is sort-of-precious and must be saved, why are home and residential distribution systems so that we drink the same water as we use to water the garden or to take a bath (grey water)? Shouldn%26#039;t houses have TWO grades of water ie two parallel plumbing systems?
Adding the %26#039;grey pipe%26#039; on older houses seems kind of late to do cost-effectively now, but can we still do this on newer houses? Would it be worth? Imagine how cheaper it is for a plant to produce grey water, very little filtering needed.
Am I the first one to think about this?...
http://www.americanwater.com/49ways.htm 40% 6 Votes 7% 1 Vote

You wouldn%26#039;t want to pay the taxes that would be necessary for a city to run two sets of water lines throughout the city. Neither did the people who were alive when our cities were built. 0% 0 Votes