Submersible Sump Pump, 1/6 Hp (RUP160)
Designed for continuous duty applications such as draining flooded basements, emptying water filled boats, and removing water from sinks, tubs, and stock tanks.
Pros: Moves water fast and is easy to handle.
Cons: can't get down below a fraction of an inch. There's always extra emptying to-be done.