Without a doubt, waterless urinals are “green” plumbing fixtures because of their water-conservation potential. But their optimum performance lies in how the trap seal is maintained.
For the past seven years, PM Engineer has paid close attention to waterless urinals - from their initial mention in the magazine (July 2001 issue), to their ever-expanding use in commercial plumbing structures, to their recent recommended acceptance by the IAPMO Technical Committee (June 2008 issue, page 6).