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Here in North Carolina atleast...  When you go to gas supplier to get your O2,
you have
three choices,  welders grade, medical grade and aviators grade.  The
differences are (at
least in this area) the welders grade tanks are merely topped off for the O2
fill,  the
mediacl grade tanks are drained and filled, and the aviators tanks are drained,
and filled
with with O2 that has been more closely analyzed for moisture content.  Guess
which one
is the most expensive.  Does all the O2 come from the same place? Maybe so.  I
would
not recommend the use of welders grade. 

The point is that there are very few commercial shops not mixing by partial
pressures.  If
I've got the equipment to safely mix using partial pressures why shouldn't I do
it!

However, we all know the risks associated by mixing partial pressures.  If you
add the O2
at your house and then take the tanks to the commercial shop for a top off with
air, and
don't tell them what your up to THAT'S NOT VERY ETHICAL.  The guy pumping the
tank
has the right to know what's in it to start with.  USE SOME COMMON SENSE!

Safe Diving!
Jody

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