Originally Posted by Floyd R Turbo
No, the sump doesn't raise that much in that particular tank during PWC
because I lift up the jets after shutting the return pump off. It overflows if I shut off the skimmer (at all) and then plug it back in. I don't quite understand why, so my solution is to just leave it on no matter what. If the sump level raises too far it overproduces, but goes right back to normal when the sump level drops.
Have you ever cleaned the venturi? It's the part where the airline connects to the pump. Salt creep builds up inside there and can slow down the air going into the skimmer. With less air, you have more water and it can/will overflow. It's possible when you shut the pump off there is some blockage and you don't get all the air it normally gets when you 1st plug the pump back in.