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Barrie, Just another reason to stick with a closed circuit unit like the 155. Iffin' I gots me a total scrubber failure, I just shift to the open circuit mode, and get the hell out of the water. I can manually add diluent, or O2 as I need it, all the while watching my secondary display to keep my PPO2 at the proper set point. Hell, I can even get some decompression in if I need to. Of course, to make sure that I have the "edge" in a total scrubber failure, I carry a composite 23 cu. ft. pony bottle charged to 3500 psi as an additional bailout, which is plumbed into my unit and can be used either as an additional source of diluent, or a direct open circuit bailout bottle. This gives me a total of 44 cu. ft. of diluent and 21 cu. ft. of pure 02 for a sum total of 65 cu. ft of bailout gas. If I'm doing a dive, and 65 cu. ft. of open circuit gas won't be enough to decompress me, then I will either attach a second 30 cu. ft bailout bottle to my rig (bringing my total to 95 cu. ft. of on-board gas) or hang additional gas off the boat with the "quick connect" fittings that will either go directly into my unit, or to my open circuit second stage reg on my FFM... Pretty slick, eh? This system was developed by Rod Farb - I have called it the "Farb - I don't wanna die, or get bent" system. From what I have seen and read on this board, no one has developed a safer system for using the safest rebreather than Rod. Rod takes his system even farther, with open circuit second stage regulators, in case his 2nd stage fails on the FFM. He even carries a half mask to put on if he has to bail on the FFM. But Rod is just that kind of stud... The chance of having a TOTAL scrubber failure in a 155 seems to be kinda slim. But it is nice to know that if you did have a total failure, it would only ruin your dive, not your whole day... As for semi-closed rebreathers, I wouldn't let my dog use one (and I hate that sonofa bitch...) Only a cheap stroke who can't afford a real rebreather would use one of these Kervorkian rigs... (with compliments to Mr. Irvine). If BioMarine's new CCR-500 rig works, and Dick King can deliver them within someone's lifetime Take care, Kevin.
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