The sewage systems in most houses use gravity to move waste. However in houses that have finished basements, the waste needs to be ejected up to be removed through drainage system into the septic tank or municipal sewer line. The plumbing pipes in a finished basement are located in the ceiling, running between the joists. The sink, showers, toilets are all situated below these pipes in the basement. A sewage ejector pump or sewage pump does the job of pulling the waste up as gravity cannot be used here to move waste. The pump is usually installed at the same level as these pipes. A sewage ejector pump ensures that you never face a backup problem in you basement.
How does it work?
Well, the mods operand of a sewage pump is quite simple. It has a pump and a float. You can also install back-up pump to be on the safe s ide. Some of the modern varieties also come with an alarm that keep you posted in case the pump fails.
A sewage pump is submerged most of the time. Therefore it’s also called a submersible pump. They can be automatic, manual or dual (piggyback mode). Manual pumps needs to be turned on when the need arises to move waste up the line. A dual mode pump contains a piggyback plug. These pumps can be operated both manually as well as automatically. In case of manual operation the pump bypasses the switch and is plugged in directly into the socket. In an automatic set up it is plugged in through the floating switch. Automatic pumps are best as they get activated automatically when the waste in the basin reaches a certain (usually pre-set) level. There is a sewage tank that contains the waste. It has a float that rises with the increasing waste. When the float reaches a pre-set set level, it signals the pump to cycle on. The waste then moves out of the tank into plumbing lines that move it to the main sewer lines. The float thereafter moves down as the tank is emptied and the pump shuts off. Avoid manual sewage pump to prevent sewage overflow.
Sewage pumps are centrifugal pumps and they are specially designed to allow solid waste to pass without clogging. As the motor starts, it rotates the impeller. A pressure is generated that pushes water into the impeller and from there into the discharge pipe. The pumps usually have 10-25 ft. electric cord. These pumps come with different voltage levels. They are heavy-duty pumps made of cast iron that render them long life.
Another type of sewage pump is the garbage disposal model. These pumps do not eject waste. They shred the waste into small particles and allow them to travel through the plumbing system. But this model will work only where gravity can be used to move waste.
How much will sewage pump cost?
Sewage pumps vary in price. Larger units can cost as much as $800 for a system that can pump 7200 gallons of water per hour (GPH). A smaller one can come for less $300 with a capacity of 3000 GPH.
Disclaimer: Although rate quoted in the page are typical average rates that can be seen across USA, they can vary in certain areas depending upon city and the variables associated with each individual project.