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> Most (not all) of the dive shops in this area that pump nitrox. Do not want > to pump O2 into a tank that may have air (20.9% O2, 79.0% N2) from a > contaminated source. The dive shop that also pump Nitrox are pumping "N-Grade" air, not E-Grade, or J-Grade. They feel E-Grade air should not be used for > nitrox, or gas blending. At one time they would check your tank to make sure > it doesn't contain normoxic air. They feel if a tank is labeled nitrox it > should be used for nitrox only. They look for a O2% of greater than 25%. I guess the point I wanted to make was that if you always get your tank(s) filled at a shop that fills nitrox by partial pressures, then no fill from that same station (21%-100%) should cause a re-cleaning to be needed (someone feel free to point out if I am wrong). ie, even when they are pumping you "Nitrox" (some FO2 > 21%) they are still topping it with "compressed air". If their air is "dirty" you'll need to reclean, but they have no business pumping nitrox (by PP) anyway in that case. If the air is "clean" I fail to see a reason to reclean the tanks just because you got 21% Nitrox. I respect the rights of a shop to be wary of a diver they do not know coming into the shop with 21% in their tanks and asking for a Nitrox fill. Its their butts on the line. I would however (in a perfect world) choose to frequent a shop that did not care what % nitrox (by that I mean its clean air) is in my tanks (21-100) (they don't need to care since they know the tank is still clean). Of course in that perfect world I'd have 20 sets of tanks :-) Luckily in this imperfect world I know the shop owners in the area well and they know I'm not going to put them in danger. Mike
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