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Jeff wrote:

>Use the cheap stuff. Don't tell them why you are buying it.

I've been breathing the cheap O2 for years, with nary a problem of
"objectionable odor" (got started nitrox mixing mainly because I had a big
tank of welding O2 around already). But helium, I am told is a little
different - the "cheap stuff", depending where you get it, may be an
ungraded crude helium that may have as much as 40% "other" stuff, for low
end welding and filling ballons. So, as Kevin says, one may not need the
ultra ultra stuff, but one should still take a careful look at the
analysis.


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