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This is from my manuals and not experience (never have used a BC with 
a CO2 cartridge) so flames are ok. But:

My NAUI stuff says CO2 was mainly for *emergency* inflation at the 
surface, which stopped being important after low pressure hoses made 
inflation about as fast and more controllable. For emergency ascents 
CO2 gets an honorable mention -- adds some buoyancy [and leaves you 
more in control of your ascent than you'll be if you dump much over   
about 5 lbs of weight]. But with use #1 gone, and divers letting the 
units rust out (too much maintenance for something you only need in 
emergencies, right? And anyway you've got a buddy around somewhere ...) 
they stopped being a selling point. 

I think that means they were ok, but they weren't great, and they 
won't be back. 

Dave Smith
U Tx School of Public Health

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