I use the air from the Fire Dept. here in Slidell for our PD diveteam. They assure me the quality is the same standard as our dive shop, I have seen their results and concur. They send it to the same lab for quarterly tests. It is a pretty big compressor cascade system with the stack, high and outside (diesel fumes / CO). I haven't used it deeper than about 20' but no issues. I have heard the ppm of bad stuff can be higher in their gas as they are not under atm pressure, but like I said, here it is of the same quality. BR has a shop on Gov. Str. (Mark Smith) that may be a little closer than Mandeville. Mark