So much bad or distorted info in this thread.
Ozone smells good in LOW levels but once you go past a low level it becomes irritating, you WILL know.
Yes concentrated O3 is bad for you as it is a strong oxidizer, which is why is is so effective. However:
Ozone cannot collect in your bilges and support combustion unless you really want it too, It will dissipate rapidly once you open the boat it will also continuously be oxidizing into oxygen when it contacts almost anything organic, which again is how it works.
You can smell a strong ozone smell long before it is strong enough to damage your lungs, eyes etc. You are not going to be able to stay in an unsafe amount of ozone, let alone sleep in it.
Ozone can and will destroy black
mold given enough time to seep into all the nooks and crannies the mold seeped into. It took the mold time to get in there, it will take the ozone some time also.
Anyone thinking that using bleach or a chlorine product is safe has not seen the horrific permanent damage chlorine does to lungs.
Like all tools Ozone is a tool to be used with common sense. Another tool, a lowly hammer can do lethal damage if used indiscriminately.
Yes, I use a small O3 generator in my boat and cars and NO, sorry, they are not death incarnate.
As an afterthought Ozone(O3) is simply Oxygen (O2) with an extra ion the extra ion is rapidly
lost in contact with organics or some iron based metals.
Ozone usually decomposes into O2. Oxygen is also an oxidizer and in not much higher concentrations than found in the atmosphere is also bad for you, one reason oxygen tents are avoided except in extreme cases as blindness can occur.
Use whatever tool you think you should but let others do the same. Enough Doom and Gloom