Could the answer to America's water shortage come from down under?
When I started in the plumbing profession, no one had the faintest idea how efficiently water closets flushed urine. Quite frankly, no one cared. The main problem was getting rid of the solids. The bowl evacuated the contents and fresh water was added.
It wasn't until they started to lower the amount of water that the flushing efficiency was actually measured. I'm talking about the lowering to 3.5 gpf, not the 1.6 gpf. When they went back and started measuring 5-gpf water closets, it was amazing how well the fixtures got rid of urine.