Every one is fine with the Fire guys but you need to ask if what they are giving you is food grade. (it will not be) if they fill with industrial grade you are getting all the trash from the manufacture and that is oil (all kinds), sulfurs, acetylene, argon, and other gasses that you can not get ride of in your lungs you will eventually get emphysema from the argon this is the gas that is most found in the industrial grade Co2. It will collect in the bottom of your lungs due to it’s density ( heaver then air) and you can not get it out, thus diminished lung capacity this is a real concern so be careful. You need to ask the fire guys and anyone else you buy your Co2 from, anyone, that they give you the gas chemical breakdown from the manufacture something like the MSDS of the gas; this will show you everything that is in it. Industrial Grade Co2 is a strange and ever changing animal it can have a myriad of trash or other gases in it due to the CGA control (Compressed Gas Association) this is a non government, self industry regulated organization that is not in business for the food industries they have been fighting Coke and Pepsi for some time, that is why they have (Coke /Pepsi) established their own standards for their products and buy direct from the Co2 manufactures. Remember that Co2 is a commodity and can change hands through gas broker untelling how many times, through tanks that have had who know in it last. I am sorry for the info but it is good that you know. Now I have seen a Co2 prefilled disposable 3 lbs. aluminum cylinders in a six pack from a Company that certifies the grade and delivers the six packs via UPS with the gas mixture and the NSF certification. One cylinder lasts about 6.0 half kegs they are great I think they will be on the market this fall. Then when they are spent you take them to the aluminum guy and he gives me $2.67 to $2,89 per cylinder for the aluminum. There is no trash or anything else in the gas it is pure certified food grade. They also said they are going to have the cylinders in a mixed gas as well. They were at the bar and nightclub show in Vegas this year. Keep an eye out for them.
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