I had a pump installed many years ago when I lived on the old glacial lake bed of Lake Michigan - the water table was never more than 2 feet under the basement floor. 20 years later I upgraded the system with a marine battery backup system, and the guy who removed the pump said it was still good as new - stainless steel case and all - it was a sewage pump. 2" discharge, moved mas quantities of water, but was running nearly all the time in a rain, and could not handle the water through the floor in a heavy downpour - or when the power went out. Lost lots of stuff, went to the battery backup, the floor never got more than wet after that.