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> >I notice a slight "stale" taste to the gas about 2 hours before the > >scrubber is used up. The next symptom is slight breathlessness only after > >heavy exertion. Slowly the "staleness" and "breathlessness" increase > >until I feel slightly breathless even at rest. Bear in mind...these > >symptoms only start to occur about 1-2 hours AFTER the rated life of the > >scrubber. I am pleased that there is a comfortable (1-2 hour) margin for > >error between first symptoms and end of scrubber life. > > > > Could the scrubber duration be rated for a temperature lower than what you are > using it at? This might explain the extra duration and would be important to > note for anyone using the system in colder waters. The rated time is based on the temps I use it in. I think the extra duration is from conservative ratings/my low metabolism (???) However, your point is *VERY* well taken. FOLKS OUT ON THE INTERNET: DO NOT attempt to use a scrubber passed it's rated duration!!!! Make sure you know the correct duration for the water temp you use it in!!!! (Diminishing duration with colder water; LiOH not as big a problem with that) The only reason I've pushed beyond the limit of the scrubber was for deliberate tests during training under CONTROLLED conditions to familiarize myself with the onset of CO2 buildup symptoms. I recommend all rebreather divers get familiar with these symptoms, but DO IT UNDER CONTROLLED SETTINGS!!! Thanks for underscoring my oversight... Aloha, Rich deepreef@bi*.bi*.ha*.or*
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