</span><table border='0' align='center' width='95%' cellpadding='3' cellspacing='1'><tr><td>QUOTE (Robert @ May 4 2003, 02:41 AM)</td></tr><tr><td id='QUOTE'>. I&#39;m guessing beverage grade would be good enough?

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No, it would be best to use the purest grade, some call it "hospital grade". we use a grade 5.0--"oxygen free". I screwed up once & ordered a lower machine type grade & pretty much killed our E6 chemistry, or at least diminished it&#39;s life quite a bit....I&#39;d check with an industrial gas supplier in your area--the tanks aren&#39;t that much money really, once you do the deposit. It&#39;s not like you&#39;d need a fancy regulator either for what you&#39;re doing....