o2 is an oxidizer and is not flammable
Listen, I get what you're saying is technically correct. Every time I hear "o2 is flammable" from a co-worker, I cringe just a little inside. But only a little, because really, I'd rather have lay people believe that concentrated o2 is flammable then having a long time, well respected voice of a community say it isn't without any context or warning and just leave it at that because it's "technically correct".
We're talking about people pumping high concentrations of o2 into small enclosed spaces with a bunch of electrical connections, co2 burners, etc. In that setting, high concentrations of o2 is
extremely dangerous. While not flammable itself, it vastly increases the risk of fire because when we think of combustion, we usually do at an atmospheric level of concentration. o2 enriched air lowers the combustion potential of just about every kind of common household material in existence. Materials not flammable at atmospheric concentrations become flammable. The fire then burns hotter and faster after it ignites. In some cases, concentrated o2 can literally cause spontaneous combustion (that small pile of oily rags sitting on the floor a couple feet from he tent from when you fixed the car earlier can already do this on it's own at normal o2 levels ...).
I'm not trying to lecture you, I've read a lot of your posts and know you're a smart guy and
you understand all this and already know, but anyone who reads this thread needs to understand exactly what is going on when we say "o2 isn't flammable" without any other context. All it will take is someone with an medical o2 concentrator they found in gam gam's house after she passed away to have the idea to stick an air stone on the end and an arc in an outlet, spark on on an HID light, etc in a small tent or room with poor air exchange.
To top it off, using pure o2 is likely useless, because saturating o2 levels to it's maximum level in water is incredibly easy at the temperatures cannabis is grown in. While air stones do suck for a variety of reasons, they do work and I'd bet dollars to donuts on a Sunday to say that regular air vs pure o2 put through an air stone would not yield any significantly different result in DO since it's more than likely already maxed out.
