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> It's not just in Canada.   Many of the dive shops in the Detroit, MI USA area
> will not fill a tank with Nitrox unless the tank is label nitrox ...etc.
> 
> If you should want the dive shop to put a normoxic fill in the tank, they will
> remove the nitrox label.  Thereby requiring you to have the tank cleaned again
> for nitrox use.

There is no reason (that I can fathom) for a Nitrox shop to do
this.  All you are doing is getting a 21% fill.  If they mix Nitrox
by partial pressures they simply skip step 1 (adding pure O2). You
proceed as normal except you (if you drained the tank) skip 
the O2 analysis and still record the mix on your mix sticker on the
tank (with PO2, MOD, etc...).

I hope you are talking about shops that otherwise don't pump Nitrox.

Mike

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