What is a septic tank?
A septic tank system is a common way to dispose of household sewage where there is no connection to a municipal sewer system. Septic tanks are often used when the house is located on too small of a lot for city sewer service, or if the terrain makes it difficult to get city water and sewer lines installed. Homeowners may also opt for septic systems because they are less expensive than having city water and sewer services installed.
Septic tanks are the most common type of onsite wastewater treatment system. They treat household wastewater so it is safe to release through a septic drain field into the ground. Most septic tanks consist of a concrete box or fiberglass tank with an inlet and outlet. The inlet allows waste to flow into the tank, and then be pumped out by a submersible pump at regular intervals or when needed.
The baffle separates incoming effluent from outgoing effluent, keeping each stream separate so they don’t mix together as they exit through an outlet pipe at the bottom of your tank.
Each tank has an inlet baffle to slow the flow of water and solids entering the tank. The baffle helps to prevent the tank from overflowing, especially if it is not completely full.
There’s also a septic tank outlet baffle or “effluent filter” on the other end to keep solids from leaving the tank and going into the leach field. The outlet baffle is a device that prevents solids from leaving the tank. It’s also called an effluent filter. The baffle has to be cleaned out every two to three years, depending on how much use your system gets. The baffle should be cleaned out and inspected by a qualified septic system installer or service provider if there are any signs of structural damage or deterioration, such as cracks in its plastic housing, broken legs, rusted joints, and/or corrosion around screws.
When wastewater enters your septic tank, it flows through a series of chambers called compartments. As the wastewater passes through each compartment, solid particles are separated from liquid and dissolved solids. The solids settle at the bottom of these compartments, forming sludge that can be removed periodically for disposal; liquids, dissolved waste and oils rise to the top as scum. The last chamber contains an outlet tube connected to a leach field or drain field where effluent drains from all four chambers into perforated pipes buried in soils where bacteria break down organic matter into harmless by-products.
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