tibby

I was actually just wondering about this and I was thinking if you go by weight and the sorb has been allowed to lose some of its water content (accidentally) then you'd end up with a more conservative result (maybe?).
If you go by volume and the sorb is "dryer" than it should be you would reach breakthrough faster that calculated (maybe?)
Since sorb manufacturers say a dryer sorb is less efficient I'm thinking it would help to measure by weight which would mean you make up the missing weight in water through extra volume.
Also, it's easy to check the weight of the scrubber after packing (provided it's packed the same way) and see potential differences in weight from batch to batch (again, maybe?).
This is all speculation of course, I'll have to try this and see if it's true.
Tibby

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Does the voice of reason change when you add helium to the mix?...hmm