Chicago City Hall and O’Hare International Airport have also removed their waterless urinals, citing clogged pipes. Apparently that design calls for hot water

Chicago City Hall and O’Hare International Airport have also removed their waterless urinals, citing clogged pipes. Apparently that design calls for hot water to be dumped down the urinal when the cartridge is changed to control an oily substance that builds up in pipes. The speculation is that not all janitorial staffs embrace this extra task.