I mesh modded mine, and it went from about stock of 14-15scfh to around 23-25scfh. It was a pretty significant jump. Put 3 layers of mesh on there and just ensure it doesnt rub on anything and your golden. I know its hard to cut up a $90 impeller but trust me its worth it. That being said, if you havent already bought the pump, DONT! There are many other pumps which can produce as much or more air flow for alot less than the Aquabee pump costs (~$170 shipped).