>There is no reason (that I can fathom) for a Nitrox shop to do >this. All you are doing is getting a 21% fill. > One point worth keeping in mind is that many shops that claim to have nitrox-pure air don't always pump it; they use the good hydrocarbon filters only when they are doing nitrox fills since these filters are quite expensive and have limited life. So just because a shop does nitrox doesn't mean their straight air fills won't contaminate an 02 clean tank.
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