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"John R. Rose" wrote:

> Even if you are willing to pay for the helium to replace all nitrogen,
> its not practical to do out of the bottle cascade partial-pressure mixing.
> You really have to have a Haskel pump. Just another part of cost that
> you have to figure in if you are going to dive heliox.

Hey helium is an inert gas! You can fill it through your regular compressor.
We use a modified regulator from the helium cylinder to the compressor
intake hose. The Oxygen Hackers Companion suggests using a tape sealed
plastic bag between the cylinder and the compressor.


BTW. The compressor also keeps cooler than when filling air.
Argon can be compressed, too, but then you must take care not to
overheat your compressor (thus damaging it).

Regards Frank



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