The first thing you need to do is talk to your gas supplier and ask them
about there O2 and He supply. All the different grades O2 and He that is
sold from my local vendor comes from the same supply. The only difference
being  is the amount of times they vac. a bottle before it is filled and
whether they certify it or not (analyze contents for purity).
I personally have my own 3500psi storage bottles that they fill as they
would high purity but do not certify, which makes for cheaper fills. The
benefit to having your own bottles filled and not swapping them out if your
not buying high purity is knowing that there is no contaminants in the
bottles.
So the best thing I can recommend is talking to your local supplier and hope
they are as willing as the company I deal with.

Good luck Rich

----- Original Message -----
From: "Brian Hunter" <longhorne@al*.co*>
To: <decoplan-info@gu*.co*>; <techdiver@aquanaut.com>
Sent: Wednesday, December 06, 2000 8:33 PM
Subject: o2 gases


>
>
>     When buying o2 for mixing at home is it necessary to buy medical grade
or can you use welding grade? I have heard you can use welding grade as long
as the purity is good, and also what grade of helium should I buy? Any help
would be greatful.
>
>
> --
> Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'.
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