If it's yellow, don't let it mellow!

Here's another favourite of mine - the waterless urinal. Instead of having a trap underneath where urine collects and smells unless it's flushed away regularly, with these there's no trap - the urine just flows straight out of the building to the sewer. No trap, no smell, no need for flushing water. All that's needed is a bit of a wipe down now and again! Brilliant.