When the bathroom, laundry room, or any other type of plumbing is located below the level of the main sewer or septic tank line that flows from the house, a Submersible Sewage Pump, also known as a suction jet system, is used. The flow of drained wastewater depends on gravity, so any piping system with a fixed device located below the mainline of the sewer requires a pump or some device to lift the wastewater so that it can properly go down and out.

　　What is a Submersible Sewage Pump?

　　The principle of the Submersible Sewage Pump is similar to that of a groundwater sewage pump, but instead of leaking rainwater out of the home, it lifts waste/sewage and discharges it into the main sewer or septic tank.

　　Most commonly, jet pumps are used in homes with basement bathrooms or laundry rooms. Not all basements need them, but when the municipal sewer to the street is higher than the fixed installation, jet pumps are used to pump liquids and solids into the sewer to make it flow properly. Submersible Sewage Pumps are also common in septic tank drainage systems, such as in rural areas where septic tank drainage areas or storage tanks may be much higher than the basement plumbing.

　　The Submersible Sewage Pump should be installed in a sump that has been cut and dug into the ground. For a medium-sized family, this sump can collect and hold about 30 gallons of garbage on average. The drainage pipes from various fixtures in the basement slope down to the side of the sump. When the wastewater level in the sump reaches a certain height, the movable float on the Submersible Sewage Pump starts the pump. The wastewater is then pumped out of the pool and discharged to the water level of the sewer or septic tank. Once the water level in the pool drops, the float will fall back and turn off the pump until the next time the pool is full.

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