I got the overhead sump running last night. It's 8 ft long and full of the clay hydroponic media. I'm using 1/2" pvc for water flow with a 1" for emergency overflow. It's flowing 80 gph with a little submersible pump. This is not my main source of filtration. It's more for the plants and possibly pepper plants. I'm running an Ultima II 1000 with a Reeflo Sword tail.