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> An interesting question that I'd like Rich and Rod to answer is this: If > you have elevated CO2 at 140, like you reported, and you ascend, does the > concentration dose of the CO2 lower as well, or is it independent of depth? > If it is the former, rather than the latter, would this explain the > lessening of perceived hypercapnia symptoms? I pretty-much covered this in my post to Mike. I definitely applies to OC ascents. If you're on CC while ascending, then whether or not the PCO2 would drop depnds both on the difference between CO2 produced by your body and absorbed by the canister (i.e., the degree to which you are outpacing your canister's ability to pull out CO2), and the ascent rate. > He told me that I should lean backwards, with the cannister lower than my > head, and take full breaths with the unit positively pressuring my lungs. > I tell you, it works fantastic. On my last dive, I swam like a dog against > the current, just to get myself huffing and puffing like hell - I then > stopped (I was in 50 fsw) leaned back and took some deep breaths. Damn. > Felt goooood. I thanked ol' Rod there and then for that tip. Got my > breathing rate down within seconds. It's easy to gfet this same effect on the C-L - you just add a little gas to the breathing loop. You can fine-tune the degree of backpressure (puffy cheeks) or "vacuum" (suckin' wind) using loop volume instead of body orientation. > Now, as for what I would do, iffin' I were you... I'd just change scrubber > more often. The stuff is cheap when compared to the other things we have > to buy for these rigs, so maybe a Hoover like you should change it more > often, or reduce your intake of Pop Tarts, which is known to increase > vascular CO2 levels when fed in mass doses to laboratory rats... But before you do any of that stuff, make sure your headache wasn't induced by your breathing pattern, rather than a failing canister. > Also, storing your sofnolime in an open bucket next to Kimo's '56 Chevy > exhaust in the garage isn't a good idea. Ohhhh!!! NOW I understand why John didn't get as many hours out of his cansiter as I did in PNG - he kept his Sofnolime in an open bucket in the engineroom of the boat. Aloha, Rich
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