Here you are Steve: ....with lights on 18hrs, 4-6" from screen .....sits at tank level, clear hose is drain back into tank ...........black hose @ mid right is return back to far side of scrubber (where valves are) Used a Rio 1400 mounted on MagMount for return. Specs are 35gph for every inch of screen. 11" of screen = 385gph. Black hose is about 4 1/2' & just about perfect flow from pump. This is for a 55g tank. Specs are 1" width of screen for every 10 gallons of tank. But since this is a 1 sided scrubber, you have to double it....hence 11" width. And there you have it. I'm glad to get your approval to Matt.