How old of air to breath?

[h90]

There shouldn't be any organic "stuff" in scuba breathing air unless the fill station has totally disregarded all protocols.



Short answer: Since it's a steel cylinder, analyze the gas for O2 content before you use it, even it's filled with just air. If you get a funny O2 reading, drain the cylinder and have it visually inspected. If the O2 reading is okay, it's good to go in all likelihood.

Here's the long, long, detailed answer with the facts:

http://www.scubaboard.com/forums/ta...-cylinder-long-term-storage-fact-fiction.html

To add: every shop, dive boat that is used to Nitrox has an O2 analyzer, so a quick test should be simple