Hey guys I'm bringing a keg to my parents place for Christmas and was going to use my keg king mini reg to push the beer. I've got some x tech co2 cartridges for filling bike tires at home and was wondering if they would be OK for this? The last lot of cartridges I bought (also for bike tires) were food grade but these don't seem to be or at least aren't advertising as being so. I did a test and pushed a cartridge of co2 into a cup and nothing but gas came out so think it might be OK. So what do you think should I use them?