Mines pretty much a one way trip.....I will take a pic of main rez. X-C does a recirculating thing with his....I'm sure he can photo his for you. The main reason I have them hooked together is for filling and emptying the buckets without having to do them individually. I do have a cheapie water pump that I use to draw water out of the buckets just because it's alot quicker than them draining naturally. But they don't recirculate between each other

There was an old thread that BlueBear started.....DWC club or something here. I'll see if I can bump it back up to the top because I remember X-C, Bluebear, me, and Latewood had an intense discussion at one point about growing in one large rez vs individual buckets. Lots of good info and first-hand experience in the pros and cons in that thread.