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"welding supply" is just what I call the places that sell gas, like Broward Welding, also known as Tri-Gas, in Ft Lauderdale. I personally like Balloon Helium, as is comes from balloons, or the Mango-Flavored Oxygen, that comes from Mangoes. Medical Oxygen comes from Hospitals, and Aviators Oxygen comes from Jet Engines. They just call this stuff oxygen, it is not really O2. If you go to a dive shop, they will always have the right stuff, as they have taken hundreds of hours of training in Tom Mount's swimming pool, and know just what flavor to get. Be careful with Balooon Helium, as it tends to make your tanks float , and welders oxyegn will make them "weld" the valve on. Aslo, get a helium lock for your tank valves so your helium will not escape overnight, leaving you with nitrox, which happens all of the time. This is why you hear of so many accidents - you must dive them right away if you have no helium lock, but roll them around for about six hours to get them mixed, or they will stratify just before all of the helium escapes.
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