The price might be cheaper,
but you still have to wipe down the room first, tape the room, give it 60 minutes of treatment and get the same 66% decrease in C Diff as you get with the Xenex system (except with Xenex you need to be within 4 feet of the UV emitting bulb).
MZEI is far superior to either method above.
From the Sanosil review:
"During a recent study of the HDS system at Pennsylvania Hospital, a 496-bed urban teaching hospital in Philadelphia, PA, infection control experts cut the rate of C. diff infections by 66% after deploying the HDS system in patient rooms, operating rooms and treatment areas."
I prefer 100%.........................NOT 66%.