the reason for industrial grade being more pure is the risk of explosion in an industrial setting is higher... there are no lubricants used in industrial grade, and they are filled the same way...
just buy yourself a tank, and if you are hesitant about exchange, have your tank refilled... hell you could probably get your medical tank refilled at the weld supply store..
and it is drier than medical grade...
industrial grade is better quality than medical grade...it has to be ( you can check this out for yourself )
If that’s the case, then great. I just have a “thing” about compressed gases, having seen some truly impressive scenes of what can happen when things go bad.
Oxygen can be some scary stuff.
As a ha-ha, here is a hilariously out of date US Navy training film about liquid oxygen. A little graphic at times, but mostly bizarre. “Man from LOX”.
http://www.youtube.com/watch?v=Q9sIT6P_05I