Septic tank
A septic tank has one or more concrete or plastic tanks between 4,500 and 7,500 liters (1,000 and 2,000 gallons). One end is connected to a pipe coming from a building and the other to a septic drain field. These pipe connections are made with a T-shaped pipe, allowing liquid to enter and exit without disturbing anything on the top of the water. New tanks usually have two chambers. Each has an access opening and cover and is separated by a dividing wall with openings located about midway between the floor and the roof of the tank.