This may be a heck of a lot cheaper than an inverter and batteries for power back up. Might even be feasible for folks that have aquariums that don't want to lose their fish during an extended power outage.
Interesting ideas from you and Bruce concerning the use of O2 cylinders for aeration and backup aeration.
If I may, I would suggest that y'all periodically crank the adjustment screw in and out on the regulator, and turn the cylinder valve off and on a few times. From my experience with oxygen regulators, I've learned that the internal parts have a tendency to stick together after sitting motionless for an extended period of time. Especially the high pressure seat. Doesn't cost much to fix, but it can be very inconvenient. It'd probably be a good idea to have a rebuild kit on hand.
BTW, according to the specs, the oxygen generators I linked too in my previous post produce 96% oxygen, at rates of 5 to 10 liters per minute. Not sure about PSI.
