A septic effluent pump is added to a home sewage system when an area is not adequate to allow for gravitational flow to work properly. It pumps effluent, or waste-water, into the drainfield from a second underground tank. Conventional septic tanks do not include a septic effluent pump. They simply rely on gravity to carry waste-water from a home's sinks, showers and toilets into an onsite sewage treatment system. This system typically consists of a buried tank and drainfield laid out in beds of sand and gravel