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You can get oxygen toxicity if you dive too deep using Nitrox. There are set depths for set O2 percentages used. As others have stated, you really need to take the specialty class. I know there are some on the board that dive it without the training but that is a whole other thread that has been whooped to death.
Yes, in fact when I had my one of my tanks cleaned for NITROX I had them fill it with 21% because I didn't have a dive planned for its use.
I'll only NITROX for "special" dives where I want more bottom time without going into deco. I've got 3 tanks filled with NITROX for diving the U853 this Sunday, for example.
I dive both, it all depends on availability as there is no Nitrox filling station where I usually dive locally and I have 3 AL80s and 1 AL100 HP usually with EAN36. This is usually fine when I do not have a planned buddy over a weekend of diving.
If I am diving with my daughter then my Nitrox covers two dives each, any more and we are on Air. When we use air depends on what dive sites we are planning to dive, and that is where planning using tables comes in to action, sometimes we dive air first and then move on to Nitrox for subsequent dives.
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