How green are low-flow toilets

Americans use, on average, 13 million gallons of water every minute — 14 times faster than the natural rate of replenishment.

Many high-minded ideas have been proposed to solve this coming crisis, but the simplest solution may come down to plumbing.

There are 300 million toilets in the U.S., and they are the biggest water wasters we have. Many use three to five gallons with every flush.

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