It's an interesting question; for a lot of my shallow dives in New England I don't bother with Nitrox. I guess that's all relative to some people but I generally don't use Nitrox less than 60fsw.
If I am diving stuff in the ~120-130fsw range, I will often ask for a custom 28%-30% blend.
If going deeper (150fsw/45m) I would usually just do it on air since I don't think it's worth it to ask for a nitrox 25% mix. Most of these would not be recreational though and I would probably be using 50% or O2 for a deco gas. I'm not trimix trained yet but beyond this I would be adding helium to my mixes if I had that option.
Otherwise I stick with standard Nitrox mixes when the dives call for it. The alternative is I use whatever left over nitrox mix that I have topped off with air.
If I am diving stuff in the ~120-130fsw range, I will often ask for a custom 28%-30% blend.
If going deeper (150fsw/45m) I would usually just do it on air since I don't think it's worth it to ask for a nitrox 25% mix. Most of these would not be recreational though and I would probably be using 50% or O2 for a deco gas. I'm not trimix trained yet but beyond this I would be adding helium to my mixes if I had that option.
Otherwise I stick with standard Nitrox mixes when the dives call for it. The alternative is I use whatever left over nitrox mix that I have topped off with air.