What kind of filtration? If you have a sump with no sponges etc. you might be able to add one betweeen the baffles. It's likely just very fine sand and other particulate matter. I will ocassionally lay a paper towel over my sponges to collect the very fine particles they dont. Dont leave it there for long, it'll eventually breakdown.
Just a few hows every so often, then remove it and toss it. Also it will pretty quickly plug up and back up, potentuially causing a flood. So watch it pretty closely.