With a GARDENA submersible pump, you can empty your pool or pond. You can also use this GARDENA water pump in case of floods. There are submersible pumps for dirty and clean water. Choose a dirty water pump if you want to pump water with leaves or other garden waste. The pump uses a float switch or sensor to see how high the water is and pumps it automatically. The submersible pump also stops when the water gets below this level.