When it comes to installing a subsurface septic system, there are actually a few different configurations to choose from. Before installing a septic tank, you need to think carefully about what type of substrate system you want to install and what type of system will work best for your property.
Gravity Septic System
With a gravity septic system, you have to have really deep, good soil that you can bury the septic system in. The purpose of the system is to allow gravity to pull the water from your home to the septic tank and then from the septic tank to the distribution box and drainage field. The drain field is usually made up of crushed rocks, such as gravel. It is supposed to be easy to take care of, as gravity drives the system and pushes materials through the system.
Conventional Pump System
With a conventional pump system, there is an extra part beyond just the gravity system. The septic tank is still usually located down from the house so gravity can pull the wastewater to the septic tank. After the septic tank though, there is an additional pump tank. The pump tank pulls the water from the septic tank and then pushes the water through your drainage field. Once again, the drainage field is made from crushed rocks.
With a conventional pump system, you have the additional responsibility of taking care of a pumping tank. However, the pumping tank should ensure that the septic tank and the drainage field work as intended.
Pressure Manifold Systems
Next, you have pressure manifold systems. These are more complex than the previous two systems. In addition to a septic tank and pumping tank, there is a pressure manifold before water is pumped into the drainage field. The drainage field is more spread out, with the pressure manifold responsible for sending equal amounts of wastewater to each branch of the drainage field.
The type of system you need depends upon the set-up of your property and the quality of your soil. As far as price goes, generally the gravity-based system is the least expensive, the with pressure manifold system being more expensive. However, the overall price is really a difference of maybe a few thousand dollars, which isn't a big difference when you are thinking about installing a system that will last for decades. A septic tank installation team will be able to evaluate your property and determine which system is best for your home.