He's been under the weather lately and probably missed the thread. I think he was asking about the design type and how it was put together, but you pretty much answered it. I'm guessing it's a counter current design, right?
I have a six footer waiting on my SW tank. It is a beckett crossed with the design with a collumn of bio-balls (can't think of the name, but ETS comes to mind). I think the design may be a loser but it was able to produce skimmate with fresh water.