Sewage ejector pumps remove sewage containing solids from drains where a gravity system won't work, such as in septic systems that are below the main sewer line. They have no screen on the bottom of the pump and a large outlet at the top to allow debris to flow through freely. These sewage pump systems mount in a basin where waste collects from a drain pipe and they're turned on and off by an attached switch or control panel. The wastewater is then pumped out of the basin and up to the main sewer or septic line.