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> If the cannister is a circular tube filled with "large surface
> area" absorbent material with the CO2 rich gas entering on
> say the bottom you'll see spent material on the bottom,
> than an active scrubber "ring" moving upwards and then
> above the currently active region, the unspent scrubber material.

Actually, I think it's more of a zone than a ring.  I'm not sure how 
broad this zone would be, and I imagine it depends on the canister 
design, but I imagin it could span the entire height of the canister.


> 
> It seems to me that if this view is correct then to a
> first approximation the length of the active region
> stays about the same but the speed at which it moves
> upwards depends on the rate at which CO2 is removed.

Unless it's a zone that spans the whole thing, in which case the degree 
of "expendedness" would gradually increase over the whole canister.

> And if correct, the residual amount of CO2 at the
> exit port stays very small until the active
> region approaches the end of the tube.  Nor does
> the efficiency of the scrubber depend on it's history
> but rather how much active material is left.

I think the degree to which it's a "ring" or a "zone" depends on a lot of 
variables, but I suspect it's more of a zone in most cases.

Rich

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