The cannister was made out of an old AUL Spectrum 7 dive light housing, with large holes drilled in either end. It is simply held in place by stretching the bottom of the counterlungs over the ends and tightening the band clamps. Note the cheesy stainless screening held on with packing tape. That worked great, although I later added a layer of foam inside to cut down on the dusting, which was pretty severe immediately after filling the unit. Another interesting thing is the location of the hole. Looks obvious, but you can get up to an inch or two of water in the bottom of the loop without getting any in the scrubber, and that is quickly absorbed by the TP. 4-8 mesh sofnolime is preferred over 8-12, for work-of-breathing reasons.

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