A more recent innovation is urinals that do not use water at all. Models introduced by Waterless Company in 1992 and others in 2001 by Falcon Waterfree Technologies and Sloan Valve Company, as well as Duravit, utilize a trap insert filled with a sealant liquid instead of water. The lighter-than-water sealant floats on top of the urine collected in the U-bend, preventing odors from being released into the air. Although the cartridge and sealant must be periodically replaced, the system saves anywhere between 15,000 and 45,000 gallons (approx. between 56,800 and 170,000 liters) of water per urinal per year. Other companies, such as URIMAT do not use a cartridge; instead they have developed an outlet system that traps the odor, preventing the smell often present in toilet blocks. They can be installed in high-traffic facilities and in situations where providing a water supply may be difficult or where water conservation is desired. Due to high-level water restrictions, Brisbane has mandated conversion to waterless urinals and flush urinals are rarely seen.
But how these waterless urinals work? You will learn more on this site: http://www.falconwaterfree.com/how/stage2.htm
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