When I made my sump, I had the same idea in mind. I used scrubbies, under the drip plate that was covered in floss. It didn't work as efficiently, and poo ran into the scrubbies.
I've since fixed it a bit and added a few things. One of which was adding filter socks. They collect all junk and polish the water nicely.
I'm about to pull my sump out and drill a hole so I can have an automatic drip. When I do this, I'll probably redesign the sump a bit. Water will drain into the filter socks, go down through some sponges, come back up and then run over a drip plate and over the media.