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> In Fiji last year I ran my canister to 11.5 hours with no ill effects, > obviously the warm water opened the window wider. Like the military guys > said however the "stuff is cheap" why take a chance. I totally agree - I never use the stuff up just to stretch my $$$. I'f I'm doing a serious deco dive, I'd rather trash a partially used canister and start fresh. However, when I've only got about an hour or so left, I'll usually burn it up in very shallow water under the boat - just so I can get another datapoint on when the canister actually died. After I have enough of these datapoints correlated with time in water and O2 consumed, I'll have a better feel for what my own individual variation is for detecting subtle hypercapnia symptoms. > A thought I had while deciding on limiting the time, or extending the time, > on the canister had to do with "off days" of my physical shape. I run and > pump iron to keep in shape and like most people, on ocassion I have off > days. Some days it's just not as easy to run the hill or push the extra > plates up. Some people would call these bio-rythms. Do you think that these > off days could have an effect on the bodies ability to withstand certain > levels of co2 vs the good days being able to withstand more. If so how do > you know when you are going to have a bad or good day and when and how far > you should push the canister. Will you be able to push it as far every time? That's EXACTLY why I do push the canister in shallow water - to get a larger sample size of on-days and off-days, and a better feel for what the variation is. When I push the canister to the end, it's certainly not to save a few bucks or push any sort of limits for the sake of pushing limits - I want a more rubust dataset on the characteristics of dying canisters so that I am more apt to 1) spot the symptoms when they start showing up unexpectedly, and 2) be able to predict with greater accuracy how long a canister will last before I even get in the water. When I get numbers I am confident in, I will probably draw the line at where I actually change the absorbent at one half to two thirds of where the "actual" limit is. Rich
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