If it's yellow let it mellow   

A common American saying to encourage water conservation is:

If it's yellow let it mellow. If it's brown, flush it down.

This is good advice in American toilets with their high water levels, but in so-called "European-style toilets" (also used in Australia and other countries) this leads to a higher concentration of urine, and an unpleasant smell if left. However, modern European-style toilets have a half-flush, suitable for use with urine. The Ultra light flush idea may be a way of saving even more water.

[edit] See also

• Water conservation in toilets
• Ultra light flush

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