Hidden Closed Loop Intake

[Delphinus]

Originally Posted by banditpowdercoat

Acctually, we have a outage atleast once a month. AND, I shut my pump off completely every water change.

My closed loop intake is at the bottom of the overflow. And the drain into the sump is a Durso style. There is No reason why you cant have a Closed loop intake in an overflow

Are the closed loop inlets and outlets at the same height or higher than the overflow standpipe? I had totally convinced myself that it would drain the tank to the standpipe because the main tank is open to the overflow via the closed loop plumbing, but there must be something that is preventing this?