Automatic bilge pump is suitable for medium-big boats. The pump provides a special switch that check every 5 minutes the bilge water level. When the float rises, the pump begins to turn on. It will delay it's activation for two seconds, thus eliminating any false starts. When the float drops and the pump senses no load against the impeller, the shut off phase begins. At that point the pump will remain on for an additional 15 seconds allowing the pump to take down the water level , drastically minimizing odors and excess water.