My tanks came with foam filter elements and ceramic "bio balls" and have three chambers. What I have done is put live rock rubble in a sock for the first chamber, a large amount of the ceramic balls in a sock in the second chamber and have bought and cut better quality foam filters from a course and much finer foam for the third chamber. For my weekly maintenance I pull the sock of bio balls and the foam elements for a quick rinsing, while leaving the live rock rubble alone, which does most of the filtering IMHO. Lots of other ways to set your system up and the way I do mine would not be good if I did not do weekly rinses on them, but I don't mind because it only takes five minutes per tank and there never really seems to be a lot trapped in them.
Fishtaco