Went out of town for 5 days. Normally, my auto-top off container was a 2 gallon pale in the cabinet under my 90 gallon, but it could hold a max of 4 days of worth of water, so I filled my 20 gallon water change rubbermaid and put the top off pump in it. I didn't move the output of the osmolator pump though, which was clipped to the side of my sump in the cabinet. What I didn't realize was that having 10 times the normal amount of water above the pump in the rubber-maid combined with the extra height the hose gained going up and over the top of the bin was enough to start a siphon the first time the osmolator pump kicked in. It emptied about 15 gallons of top up water in to the sump on the first day we were gone, and since it was only 5 days, I didn't have anyone coming to check on the tank.
Thankfully nothing died, but it overflowed the sump, filled the cabinet with salt water, and spread out across our finished concrete floors. By the time we got home, it had mostly dried so there was a huge salted patch that had eaten through the finish of the floor. The argument that started nearly spelled the end of that tank.
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