OK.. first off, there is just water in the bucket. I wanted to test to make sure that the water would flow correctly. Also the when I shut off the pump that the pressure would not cause any leaks. Both have tested good.
The pump I got for 75.00. They sell tham at Grainger. 600 gph
The plan is to put eggcrate 5 inches from the bottom of the bucket, and then to layer the filter media on top of that including charcoal. The canister will be filled completely with water the whole time and the pump will draw the water through the filter and back to the tank.
As I build the one that will go on my tank I will take pictures and post them with step by step instructions including a material list. Here are a couple more pictures of the test setup.