Ozone is bad for your health if you breathe it in when its concentrated, i.e through a mask, in its pure form it will burn the membrane of the lungs and cause damage to the mucus covered tissue however, The health benefits of Ozone are well documented, you can even stick the outlet pipe up your ass or in your vagina for 10 minutes a day and its excellent for your health... google it, but don't expect to see it on any gov.org website, after all sickness generates 99.9% more money than good health for the corporations.
Corrosion/Rust = 2Fe(s) + O2(g) + H2O(l)

Fe(OH)2. No Ozone involved in that reaction.
Pioneering medical practitioners are now injecting Ozone directly into Arthritic joints and are having tremendous success rates of curing patients. It is known to heal open wounds faster and cleaner when the affected body part is placed in a local positive pressure O3 tent. There are private treatment centers where you can go and lie on a couch and have blood extracted from a vein in one arm, it is pumped into an Ozone bubbler so it is enriched with Ozone and then through a micro-filter (same as in kidney dialysis) before being pumped back into an artery in the other arm. After the O3 reacts with all the nasties and kills them, they are trapped in the filter and the process leaves you with an Oxygen enriched blood stream clean of all pathogens. A mate had this done in Jakarta and Batam has a place also, probably one in Bandung also, but not sure.
As Davita says Its great for boats, it kills all molds and sterilizes confined spaces. You can throw pillows in an airtight bin liner and inject Ozone in it for 15 minutes once every cpl of months, kills all those nasty micro parasites that live in your pillows stone dead. It is used in the food industry for cleaning fruit and veg.. swimming pool water treatment, Hotel and Hospital HVAC systems, the list goes on.
If I was filtering water from a well bore, I would definitely Ozonate what we intend to drink after it comes out of the active charcoal filter and renew the filters every 3 months regardless of what manufacturers claim, that's just my preference, each to his own.
Thanks,
Kev.