Ahh...so ozonated water helps preserve chopped flowers. Cool. <kidding>

Perhaps it's because it was delaying the decomposition of the flowers. Could it be killing molds and bacteria that dine on dead/dying plant material, giving the appearance of slower die-off...? I could see a possible use in cloning, but beyond that, IDK...

Have you tried not using the O3 water on healthy plants, and see if there's a difference? Personally, I wouldn't spend the extra $ unless I had supporting evidence that it works enough to justify the cost.

Side note:
I use my wellwater from the tap. A little adjusting with phDown, and I'm good to go. I still don't know why all these guru's insist on R/O or other 'designer' waters, but I suspect it's preventative medicine for newbies. Other than adjusting my ph wrong, I've never had a water-related incident, even when I was living in Vegas. (smelled and tasted like the worst tapwater in the civilized world) I did let it sit uncovered overnight to outgas the chlorine, but take away the chlorine smell, and you get the pre-chlorinated smell. <yuck>

These are my feelings, and my feelings are not to be confused with fact. I am aware that some cities have lower water quality, but I do feel that low quality tap water beats high-dollar bottled water quality every time. Not only is the filtering costly, so is having to purchase the additional nutrients, minerals and metals that the filtering process takes-out.