Quote Originally Posted by Shaggy Hiker View Post
I'm curious about that. I think I agree with you. I can see some real negatives, but I'm wondering what your thinking is on this. The reservoir water is an emergency drinking water source due to it being currently sanitary (unless you add some kind of nastiness to it). That doesn't matter to lots of places, but it was something to consider when I lived in the Florida Keys. Now, out in Idaho, we have virtually free gray water for irrigation (untreated river water). If that was used for toilet water, it would....do absolutely nothing to my water bill because I use less than the minimum amount of water so I pay a flat rate, but other than that it would be theoretically beneficial. The only issue is that the irrigation water is 'chunky style'. There is algae bits in it, which would mean that I could get plants, fungus, moose, and things, living in my reservoir unless I was flushing often.
When you look at the big picture, the numbers aren't that small. I've found somewhere that an average person flushes between 5 and 6 times per day. So if you take rough numbers, for a population of 300 million to flush 5 times consuming 1.6 gallons, it comes to 2.4 billion gallons of water per day, just for flushing the toilet.

One alternative, which isn't applicable to all locations, for example 80% of households in Hong Kong use seawater for flushing.