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Message: <blockquote data-quote="David2012" data-source="post: 1875328" data-attributes="member: 24428">Thanks for the info. When refilling, do they refill your CO2 tank while you wait and then give it back to you...or just swap your tank for one of theirs... like most places do for welding tanks? I know that when I bought my used #5 Oxygen and #4 Acetylene tanks.. when I took them for a refill.. the welding supply places just exchange the tanks. If I had wanted to keep my tanks it would have taken almost a month to send them out on the next truck and get them back again. I sure hated swapping them out because they were both like new. Several of the ones I've had since looked very well used.Also, does the CO2 gas need to be filtered between the regulator and the soda? Just wondering, as I didn't know how clean the refilling process was at a welding supply... is there ever a issue with getting the CO2 contaminated with any particulates?</blockquote>