I'm running a mag950 unfiltered through my scwd for the past 4-5 months. I'd guess that I'm getting around 600-700gph through my outputs... maybe a bit more. The outputs switch once every 7 seconds or so. This is on top of the two MJ powerheads I have running in the tank. I got some pretty decent random flow in my tank... and it got better when I stuck on two ocean motion revolutions on there. Needless to say, I got a pretty high turnover rate on my 30 gallon
-Richer