| Food grade O2
One cheaper way to get O2 from your local supplier is to ask for "food grade" O2. The product code is the same as that used for medical O2 but but cylinders used for food grade O2 are kept cleaner than welding cylinders.
That said, if you use welding O2 with a regular hp filter (activated carbon plus mol. sieve) IMO you should have no problems.
Hugh |