Now Fill This! The Machinations of a Mad Mix Maker

I think it is safe to say that rarely do most scuba divers think about what goes into filling their tanks. It’s simple enough, we take our tanks to a shop, and later we pick them up and they are filled. But is it really as simple as that? I mean, all you need is a compressor to fill air, and a very basic stick will get you some nitrox. Once however you …