Why Drain Your Sump?

[Frank]

I see people talk about clogged overflows, or losing the siphon on external overflow boxes. They explain that the return from the pump would then cause the main tank to overflow.

I don't understand this. Is there some advantage to positioning the pump inlet so this could happen?

Edited April 3, 2021 by Frank

[anewbie]

59 minutes ago, Frank said:

I see people talk about clogged overflows, or losing the siphon on external overflow boxes. They explain that the return from the pump would then cause the main tank to overflow.

I don't understand this. Is there some advantage to positioning the pump inlet so this could happen?

Not everyone has a properly implemented sump. In the perfect world it should be impossible for both the tank and sump to overflow but things are not always implemented as they should be.... and then disaster can strike...