Quote: (Originally Posted by James Appel)
I have a question (never having dived a rebreather outside the USA).
How do you know your getting medical grade oxygen when getting fills, as it seems that in some placed only industrial grade maybe available.
What is the difference between industrial grade and medical grade (besides medical grade is analyzed and industrial is not).
The difference is in the quality control. It all comes out of the same banks - at least in the US and I'm sure in other places where you are dealing with a major company.
The risk is in someone filling a contaminated bottle but I would expect that to be minimal with O2. It is far greater with inert gas bottles since they often switch them around - ie - repaint an Ar bottle to make it He & fail to properly vacuum it.