the ind. grade i buy has never even caused me to think about it. my compressor has 6 filters and 1 is filled with hycolite. doing dives in the great lakes up to 290' on wrecks. have been doing dives greater than 200' on tri for EXACTLY 20 years now. got info from navy dive manual....hyper. mediceine and noaa..started out on 5% and worked my way up to 50% didnot analyze in the early days,, had 3 gauges for mixing (1%) 0-300,,,,,0-1500 and a 5%gauge to 3000 the rest came easy.....have not dove air in 7 years...i like a "rich/mix" ie. maybe say 28%/30% for a dive to 140' i use abyss for all my dives,, chamber?????never once.....3 of my buddies but not me yet... jim
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