Prostormer Submersible Water Sump Pump uses 1HP power, which is more efficient than ordinary 3/4HP sump pump; Max 3700 Gallon Per Hour rating tackles any draining job at a fraction of the time. This submersible pump is ideal for draining water from flooded basements, water wells, garages, garden pond. It is also great for pool changing water work with its 16.5-feet heavy-duty power cord. If you need the pump to work in a low water level environment (the water level does not exceed the pump), the float switch need to be locked on the pump The working principle of the water pump is that the float switch goes down vertically, the beads inside are stuck on the line under the float switch, and the water pump starts automatically Kindly Tip: When you start use the pump you must be submerged into the water at a slight angle to allowthe remaining air to escape 1 HP High Power: Prostormer Sump Pump uses 1 HP power, Max 3700 Gallon Per Hour rating tackles any draining job at a fraction of the time Multi Outlet Sizes: 3 different diameters outlets (1 inch ,1-1/4 inch, 1-1/2 inch) to adapte for different size hoses as needed according to the flow rate. The bigger the flow is, the wider the outlet should be Keep Open Mode: When you put the float switch locked on the sump pump, the sump pump will keep working all the time. Once the pump can not pump any water, you should cut off the power immediately to prevent the coil from getting burned Automatic ON/OFF Mode: The float switch should be unlocked from the pump. When the water level rises above the pump, the pump will start working automatically under the control of float switch. When the pump fails to pump water, it will automatically disconnected the power Sealing Structure Durable Construction: The sump pump features a durable sealing structure and the durable thermoplastic body keeps the pump from corrosion. The higher base plate which assures the prevention of debris collection in the sump pit