Diver Dennis
Contributor
The Helium is more fun Red...

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Dive-aholic:The oxygen bars I've seen use nasal cannulas - those prongs you place in your nostrils. The most we pump through those is 6 liters, which is equivalent to 45% oxygen. However, that's a lot of air coming through 2 little prongs into your nose. It's not very comfortable. 2 liters isn't too bad, but is only 29% oxygen. 3 is tolerable but is still only 33%. They should actually be called nitrox bars.![]()