I'm surprised as well about the lack of info here about ozone.
The page that David refers to has some very old information on it (old in terms of ozone technology).
Ozone is very popular in Europe and I use it on my salt water reef aquarium.
Corona discharge is pretty much the de facto standard technology in use now which allows for a large amount of ozone to be generated.
Much more than UV.

The last note on David's page refers to what I believe is the common practice use of ozone - ozone generator with combined use of low levels of chlorine for residual sanitation.

I am very excited about the prospects of using lower levels of chlorine and wished more people using ozone technology knew about this website and posted their experiences.