The Top Runner that I have catches all heavies, and I mean all of them. That really might be the only flaw to the design. The large catch tub fills up really fast, depending on how much black sand that you have in your area. I usually have it, and my BGT Prospector in the water at the same time, and I alternate shoveling into to both. When the Top Runner fills up with black sand, I just run it through the BGT.