Aquaclears are very nice filters and they allow you to use a wide variety if filter media. Another nice thing about AquaClears is that you dont have to keep buying new filter media when you perfrom filter mantainance, just stock the filter with two standard Aquaclear sponges and when the time comes for filter cleaning just rinse out the sponges in used tank water or dechlorinated water...
If you really want to polish your water you can add a thin layer of filter floss between the two sponges.