having bad gas could be fatal,, lots of talk on the issue of using diferent gas besides compressed air being used i probably would use nitrogen myself hearing some long timers say its safe use common sense i guess thats not always the case check out raws face book page dated march 8th martin got an article there a good one he also says please do not use any gas besides clean compressed dive quality air only in his products hmmm in the article one man did a bad thing one man only everyone be careful i tried bringing article here no dice