A friend of mine sent me an email earlier. He had strayed from the safe haven of the Precision Diving ranch and took his tanks to a local dive store to get the annual visual inspection on them. When he picked up his tanks, the work order from the repair tech said that he could no longer use them for pre-mixed recreational Nitrox and were good for air only. As I read his email explaining the reason why his tanks were rejected for pre-mixed Nitrox, I just wanted to bang my head against hard objects. [Read more...]