[mikro2nd]

Not a materials improvement, but an improvement in the shape of the bowl, so mostly a direct result of better hydrodynamic and CAD modeling.

Not only do they use less water, but they /smell better/ -- most of the "smell of urine" results from the pee being added to, and reacting with, water, so no water, no noticeable odour.

[pbhjpbhj]

They are plastic though, whilst water flushed toilets, eg in pubs, are always (?) ceramic.

Seems that it could be retrofitted easily by replacing the trap if the materials aren't important.

I wonder if patent expiration is responsible for the apparent increase in use of similar systems.

Thanks for your correction.

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

[mikro2nd]

Interesting; I've only ever seen ceramic waterless urinals.