Is residential water usage really a large problem? I assume that municipalities have a decent ability to reclaim and reuse much of the water flushed down the drain and toilet.<p>I know at least for California residential water use makes up just 15%[0]. I know every little bit helps, but a toilet is an incredibly simple invention and it would be a shame to replace it with something so much more complicated.<p>[0] <a href="http:&#x2F;&#x2F;www.environment.ucla.edu&#x2F;media&#x2F;images&#x2F;water-fig1-lrg.jpg" rel="nofollow">http:&#x2F;&#x2F;www.environment.ucla.edu&#x2F;media&#x2F;images&#x2F;water-fig1-lrg....</a>