12-31-2009, 01:03 AM
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Its kinda like a pool filter I guess. There is a sealed "canister" of water which houses the media and impeller. There are two hoses that go from the tank to the filter, one is the filters intake the other is the output. Water goes from tank down into canister, goes through the media usually starting with the bottom media then working its way back to the top. Then gets sent back into the tank. Here's
a good video on canister setup. This
one how they work/go together. What media is used is up to the user. I use the same model in the video and its just filled with sponges, filter floss, and some ceramics. The water flow from the bottom basket to the top, media should go from course to fine in this manner.