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On 8 Nov 1995, RatDiver wrote:

> 
> What about the facility that rents nitrox cylinders?  How do they keep their
> rented out cylinders from being incorrectly refilled elsewhere?  Then when the
> next diver rents it, what does he get?
Shops should check that a tank comes back with the same FO2 that it went 
out with.  If it does not they should be able to check with the shop 
that filled it and see if it was O2 clean air.  If they cannot find out 
then the tank shpuld be O2 cleaned before returning to service.  This is 
one reason that nitrox fill stations keep a log of fills including tank 
pressure FO2 and tank serial numbers.

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