I snapped quite a few pics of my pellet rig
here. Let me know if you want me to email you the full resolution pictures; pm me your email and I'll email them to you.
I think this is what you're looking for though?
After the water drops into the sump and through a filter sock, the first thing that it runs into is the pellet reactor powered by a 500gph pump. The outlet of the reactor points at the inlet to my skimmer, then over a few baffles and into the return section of the sump.