I used the Multi-Purpose sand from Home Depot or was it Lowe's /doh. But it took awhile to rinse and then i realized i didn't do it enough so had to do a couple of waterchanges before i was pleased with how much free floating particles i could stand to let my filters clean.
I have yet to have to change an impeller since though. Cut Aquaclear Sponges from the AC30-AC50 fit on the intakes of all my filters(Whisper 60, AC 110, Emp 400, Emp 280 and i even put some on my Canister intakes; Eheim 2213 and Fluval 404).