It is just the numbr of times they vacuum the tanks - they fill the same type all together, like all aviators, then all industrial. The bottles go out to the specific customer types, so the aviotors guys wil not get the industrial or medical bottles, but like you say, it all coe sout of the same LOX vat, and it all runs through the same fill stations. Maybe some of these officious dive shop nitrox wizzards out to go look for themselves, and make sure these tanks and such are all oxygen cleaned and have viton o-rings and other strokery . I would love to see the guys at TriGas laugh one of these bozos off the loading dock. -G
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