Thank you so much for the explanation and pictures, made me understand t better than the YouTube videos I saw. Ok so I get it now pretty much I run two pipes on the overflow going down to sump. And my return is just an additional Hose through the back and i can even add a spray bar or somethingThe herbie drain is definitely worth looking into. I run it on my 150. I used the original drain line for my main drain, and used the hole originally meant for the return as my emergency drain. Then I just ran a return line from the pump up the back of the tank. For a quick overview... Put your main drain several inches below the water level for a full siphon. The height of the emergency drain should be the height of the water level in the overflow. Use a valve on the main drain to regulate water height in overflow box.View attachment 1220555 View attachment 1220556
Okay I think I can manage that,
Does the 2 drain pipes go down and connect into 1 before hitting the sump?