i get about 12 hours of mostly oxidizing runtime on my mirage off a K tank. i run the outerfire only about 10% of the time, though. i have a wholesale account and have swapped glass for tanks. i have a very friendly relationship with my supplier and get excellent service. I think its a sweet setup for me and have no plans to drop back to a room of concentrators any time soon. i would rather leave the oxy concentration to the pros and concentrate on producing great glass. the performance tradeoffs are too steep for me.
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