Why couldn't you put in one of those one way valves that they use for air pumps? They only cost like 1 dolllar? ???Gunnie said:I don't think that would happen in a normal power outage, but I will tell you that my seal on my filstar wasn't sealed properly, and we didn't notice until we had a power outage and we could still hear water dripping. I looked under my tank, and water was still dripping onto the floor even without power.