[Silly clownfish]

Depending how fine of a filter you are looking for, old fashioned generic ladies knee hi nylons can be bought in multi-packs and just use a rubber band to attach to the bottom of your overflow pipe.

I do this for a few hours when stirring up the substrate, scrubbing rocks, or anything that causes a lot of stuff floating around the tank.

It has been harder to find these at the local dollar store lately. Likely because no one buys them for anything other than a wet filter in their shop vac.