[Proteus]

Originally Posted by smokinreefer

Not sure what you mean?

So just put one drain and one return on each overflow?
Have one drain fully open as an emergency? And have a gate valve on the other return drain?

Would both drains from each overflow connect into a single drain going to sump?

Thanks.

Yep you got it. Just make the emergency slightly higher so If main syphon plugs the water level will rise to go down emerg

And keep both seperate. If main syphon plugs then the emerg would also be plugged(if kept together)