Les, the one that comes from the factory just turns on every few minutes...and it will stay on until it senses no load on the impeller motor. For some reason the guys on the internet freak out on that concept. I think it's great, would just like a second one aft, or maybe go with a 1100 gph instead. Seems the key is to have a pump that'll cover for me when I finally forget the drain plug on launching :-)