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  Frederic Badier <badier@cl*.do*.sl*.co*> wrote
(Subject: How to use a O2 rebreather?):-

> My understanding is that emptying the breathing bag 2 or 3 times by exhaling
> through the nose should work,

  My understanding is that purging n times wastes n bagfuls and n lungfuls of
oxygen and grossly shortens the dive. I see no need for more than: empty bag
and your lungs as far as you can, then start breathing from the set, then
purge once.
  P.S. What sort of oxygen rebreather do you or he have?

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