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Hi guys,

Richard Pyle writes that he uses industrial grade oxygen.

I've always used medical grade [B.P. - US equivalent is U.S.P grade I think]

It all comes out of the same source at the factory, but they take more care
to ensure that no contaminents reach the gas, and it isn't much more
expensive, so why not use it.  I'm sure that if your gas supplier found out
you were inhaling industrial grade they would freak out.
I'm not criticising, it just seems odd.

Regards Jason:-)

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