> the fieno uses a spring as well, but not to hold the scrubber material, it > holds the canister pac. these pacs are to be bought from the factory pre > filled. we fill our own. they look like a medium sized oil or gas filter > only are made of plastic. If I remeber correctly your modification to allow you to fill the canister yourself, the spring actually does end-up keeping the absorbent "tight" - doesn't it? Like I've said before, I think the spring concept has some merit. Rich
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