A septic tank is a watertight chamber made of concrete, fibreglass, PVC or plastic, through which domestic sewage flows for primary treatment. This process primarily breaks down solid waste. Septic systems are one kind of onsite sewage facility or OSSF, and are often used in areas that are not connected to a city or town sewer system like many areas of Citrus County. Most tanks are between 1,000 and 2,000 gallons. One pipe is connected to a wastewater pipe that comes from your home or facility while the other to a septic drain field. Everything is connected with a special type of pipe that allows liquid to enter and exit without disturbing anything on the surface. The design of newer septic tanks usually includes two separate chambers, each equipped with a manhole cover, and separated by a dividing wall with an opening in the middle.