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Thats a big difference, I was told the other day at the store 15-20 times flow. I have a 40 gallon and my pump is about 700gph. You should match the overflow to be a bit more then the pump.. not too much or else it will be shutting off (the overflow) fairly often. I guess its not a big deall...

Im hooking up my sump and it occured to me... how do people keep the flow rates matched perfectly? I had a wet/dry years ago.. and every other week or so Id come home and the thing would be running dry.. yet it was just fine before that. Is the trick to keep the gravity drain at a slightly...