I must disagree with Aspects. Any filter does indeed filter. Most filters, even this one, will work fine as a biological filter even though the plastic biogrid is probably not as effective as a biological filter as teh floss stuff that makes up most of the filter cartridge. One thing you need to learn early on in this fish keeping game, Cowboys, is that the filter maker's recommendations to constantly replace filter media is counter productive. What works better in the long run is to rinse out the media each time you do a water change. That way the filter never really plugs up and the biological filter just keeps on working rather than going into the trash.

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Fishless cycling