oh ya, but from what i read there is a lot of messing around to get it right? got any pics or diagrams? i'm not sure which way to do it...

Herbie's way less messing around than a durso (no drills involved to tune)

Its stupid simple, 1 bulkhead becomes your primary drain, add a grill or leave open - near where that line enters your sump - add a valve, preferably a gate valve. That second bulkhead - is now your emergency overflow, add a standpipe in the overflow, make it tall enough so that it's about as high as you'd want the water to run. Straight run to the sump with that (no valves).

start'er up - take that valve on the primary drain, crank her down until water level is stable in the overflow.

Thats official rule - I crank mine down so that just a trickle's going down the emergency overflow, less fiddly when done that way I find.

I have one bulkhead, and a noisy drain. My idea was to put a ball valve on the drain, so the pipe doesn't need to suck air. After discussing with my LFS, I decided not to, as a snail or something else clogging the ball valve would be a disaster. The Herbie method gets around that problem really well, and I'd love to try it. Wish I had known about this when I set-up, I would have installed two bulkheads!

cool ok i'll do the herbie method..sounds simple enough.. anyone got a gate valve? ;)