That's why I put a shut off valve just before the pump so when it sits for long periods of time you shut off the flow , if it does leak it's just a small puddle what ever is in the pump, Had this one for 15 years now with no problems.very ingenious. one concern I would have is that by having the pump lower than the tank, if there is a leak at or near the pump, the tank would drain to the floor, and there could be a fire hazard.