Waterless Urinals

I'm not sure how I feel about Wiki actually having this stuff but here it is;

Waterless urinals

A waterfree urinal

A more recent innovation is urinals that use no water at all. The innovation is secured with several patents^[which?]. Models later introduced by Waterless Company in 1991^[2] 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, boosters claim the system saves anywhere between 15,000 and 45,000 gallons (approx. 55,000 and 170,000 liters) of water per urinal per year. However, compared to a 1.6 GPF urinal, these numbers assume a flush urinal would be used between 40 and 120 times per business day.^[3]

Other companies do not use a cartridge; instead they have developed an outlet system that traps the odor, preventing the smell often present in toilet blocks. Another method to eliminate odor was introduced by Caroma, which installed a deodorising block in their waterless urinal that was activated during use. Mechanical traps are not allowed by US building codes.^{[citation needed]}

Waterless urinals 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.

In March 2006, the Associated Press reported that the plumbers union in Philadelphia had become upset because the developer of the city's newest skyscraper, Liberty Property Trust, has decided to use waterless urinals in the Comcast Center. Many in the union believed that this would lead to less work for them. The developer cited saving the city 1.6 million gallons (approx 6 million liters) of water per year as its deciding factor.^[4]

Most waterless urinals however do not remove odor staining on the surface of the urinals, if not normally cleaned. Even when maintained according to recommendations, flushless urinals emit a fish-like odor that most people find unpleasant. In February, 2010, the headquarters of the California EPA removed waterless urinals that were installed in 2003 due to "hundreds of complaints" including odors and splashed urine on the floors.

https://www.experts123.com/q/how-do-waterless-urinals-work.html

and

http://www.google.co.uk/search?q=how+does+a+waterless+urinal+work&sourceid=ie7&rls=com.microsoft:en-gb:IE-SearchBox&ie=&oe=&rlz=1I7GGLT_en&redir_esc=&ei=0RuuTPzLM8it4Qbjp7WFBg