Pot Scrubber in Aquarium Sump

[Muad'Dib]

Hello.
I'm working on setting up my aquarium and filter system. I'm going with a sump under the aquarium (Freshwater) to provide the filtration.

Has anyone ever used nylon pot scrubbers as the medium for the biological filter in a sump? I've heard of them being used in a canister filter... I'm assuming they should work on a larger scale too.

[limmer]

I use them in some of my cannisters and HOB filters.
They have lots of surface area to hold bacteria.
I use a combination of stuff, sponges and other media that I have.
I usually get them at the Dollar store.