medical o2 vs welders o2

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abracadabra

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Does anyone have experience with using 1 of those green medical o2 bottles? Is this any better or cheaper than the welder o2 from the Home depot?
 
Anything that says medical on it will automatically be higher priced. (Thank God for lawyers, malpractice insurance, and folks that try to make a living by suing others) I would assume that as long as you use a hepa filter, you'll be OK with the welders O2.
 
I ended up with a medical tank for free so it's tough for me to argue either way. You will find quite a few on Craigslist from time to time but I suspect it will be difficult to get a fill unless you know an EMT or nurse (my sister is an RN).
 
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