While I was out of town (the tanks seems to know when I leave) I had a bit of an overflow problem. My wife woke up at 5 in the morning and heard the sound of dry pumps running. What I suspect is that the power went off for a few seconds and when it came back on the Durso overflow pipe would not siphon water down in to the sump. The sump pump put all the water back into the tank along with all the fresh water auto top-off the kept replenishing the sump until both pumps ran dry. No water went down the pipe jusy over the sides of the tank. This happened once before and I racked my brain trying to figure why the Durso pipe would not drain the water. Finally i realized the small hole on the top of the pipe was clogged with salt and this prevented any siphon action to happen. As soon as I poked the hole with a paper clip thing started flowing again. I am soooo glad I told my wife of this just "in case" it happened when I was out of town. Well. it did and she remembered about clearing the hole and things started working again. Should I drill this hole larger to prevent such clogs? I'm going to be very worried the next time we both go out of town. Anyone else ever have this problem? Thanks!