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Steve,
  Aviation Grade oxygen is not regulated, that is why you don't need a
prescription. Aviation O2 has less moisture in it than Medical O2, yet
they all come out of the same vat as welding O2. The best thing to do
is find a supplier that handles the tanks the best. Find a gas
supplier that vacumes the cylinders before filling.

Barry


Outside of the fact that getting medical or any grade O2 for resq being 
no problem (even Rescue Squads in areas where diving is relatively 
common will fill your tanks) why the emphasis on vacuuming the tanks.

There exists three grades of O2 on the market - industrial (welding), 
medical (USP) & aviators.  All predicated on moisture levels in the O2. 
Thus industrial grade O2 is fine to breathe.

AGain the question of vacuuming (a requirement 4 USP).

If a tank has 'breathable' O2 in it, why bother w/ vacuumimg it to 
replenish it with 'breathable' O2 with x moisture.

We tend to overlook that we breathe, continuously, air that has an 
unknown level of contaminants.

Regards

Esat Atikkan

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