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>Dear Dennis 

Sorry for the confusion, my last posting was not clear.  I was replying to
Reima Raty's question about ambient pressure surface o2 use. 

Air breaks should be unneccesary when breathing pure o2 on the surface as an
o2 convulsion at 1 ata is extremely unlikely (45 minutes = 15%cns) and would
not cause any lasting harm in any event.

Using o2 to reduce subsequent dive decos whether  prebreathing before an
initial dive and/or between dives has proven to be very beneficial for me.
What I am interested in is finding out how to construct an o2 scrubber stack
so I can do surface o2 washouts without all of the hassle of taking along
heavy awkward amounts of compressed o2. 
Thanks
Bill
 

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