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Originally Posted by jagt48
I would think that when you buy a cylinder from a welding shop you would have to make sure to tell them what you are going to be using it for to make sure they put in more pure oxygen, free of things that you don't want to go into the water, right? Just a thought.
Joseph
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Actually most oxygen used in welding comes from the same place that medical oxygen comes from, cylinders are generally filled from bulk liquid oxygen tanks, typically 99.8% purity. The main difference between industrial and medical ox is the cylinders its pumped into and the record keeping involved.
There are some lab grade gases on the market that are even more pure but the cost skyrockets for .2 % increase.
You could prolly see about getting a small "D" sized cylinder, but you still need a regulator to administer it, otherwise the pressure will blow up your bag.
On the user end oxygen is not regulated unless you want it for medical use, then its a controlled substance and FDA requires a prescription, even if you go thru a welding supply