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As far as I know, air does not go bad, but if there is any contaminating material in the tank, even a small amount, it can taint the air.
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I've caught a bug. A bug for which no cure has been found. It is, in fact, THE DIVING BUG!! 
Never presume that an unexploded goat is an indication of a safe decompression profile.
I now have a website!! http://www.tdhessdivebc.web.officelive.com |