12-26-2007, 01:22 PM
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I have a Rena filter, which has multiple stacked compartments. They recommend the following order (which I would think should work for any canister filter):
Mechanical > Biological > Chemical > Polishing
I don't have any carbon (chemical) filtration in mine, so my stackup looks like this:
Black foam mechanical filtration > BioStars > Microfilter mechanical polishing filter
I plan on adding ceramic rings as well, since I have some open space in my middle tray, and if I ever need carbon, I'll put it in the top tray right under the microfilter (Rena filters from bottom to top).