It says replace after 12 months but maybe that's for people who don't drink as much as you do psychodad? [

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I'm thinking of getting one myself. I filled my CO2 tank at a place that does soft drinks so it *SHOULD* be food-grade CO2 (I would think). But (and this might just be coincidence) after having the first beer out of my system, the next day I had a bit of a cough and shortness of breath (the headache and queasy stomach can be attributed to my celebration of the installation of said system!)