Miscellany: Waterfree Urinal

Our law school bathrooms feature a urinal design which I've never seen anywhere else. It's a urinal that has no flushing system - a Falcon Waterfree model:

Odd, no? No operating needed, no connection to the plumbing aside from a drain line. Urine goes in, gets filtered through a sealed cartridge, and eventually drains out along with the rest of the building's wastewater. The cartridge prevents any unpleasant smells that might be present in conventional drain-only urinal systems.

It seems to work okay, though I have seen the system get clogged up - then you have strange blue liquid in the bottom of the urinal bowl.