I wrote:- Ordinary-sized small oxygen rebreather cylinders are soon emptied by a few repeated flushings of bag + lungs. Flush once when going from air (from aqualung, or at the start of an ordinary oxygen rebreather dive), then not again unless you inadvertantly breathe air thereafter. Thus likely it would be useful on an oxygen rebreather dive, for there to be a large (aqualung or welding size) oxygen cylinder on shore or in the boat for the divers to flush their sets and lungs out with before diving, so they don't have to drain the sets' small oxygen cylinders for that.
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