Getting to know the interior of your septic tank without getting your hands dirty can be challenging. However, all septic tank installations must be preceded by a soil evaluation and a septic tank diagram. These layouts or diagrams do not only include information about the installation but the components, fixtures, and everything necessary for the system to work properly.

In this blog, we will show you how a septic tank looks on the inside by looking at a septic tank diagram that contains details about the structure and disposition of the chambers. In that sense, you will be able to understand why your septic tank does what it does, and most importantly, you will learn how to take care of it as you gain confidence.

  1. What’s in my septic – Structural Setting | Nortex Septic Designs
  2. Trash tank
  3. Aeration chamber
  4. Settling chamber or clarifier
  5. Pump Tank
  6. The aerobic septic process | Nortex Septic Designs
  7. Septic design and inspections in Texas | Nortex Septic

What’s inside of my Septic Tank? | Nortex Septic Designs

Additionally to the components that we reviewed in the previous article, an aerobic septic system has a distinctive geometry. 

It is precisely that singular structural setting that makes it possible for this advanced unit to provide a more rigorous treatment. Eager to hear about that?

Let’s look at the inside of your septic system and pinpoint each one of those.

Septic Tank Diagram – Geometry of Chambers  

Trash tank 

This is the first place where the wastewater comes to and also where the main settlement occurs. The main objective of this first chamber is to remove the heavy particles, the much lighter ones, and most importantly, to filter any non-organic matter that the system will not be able to process. 

That said, the sludge will mostly be accumulated in this chamber, which is accessible from the top through a plastic lead. So, when the time comes for you to pump your septic tank, you know where it is going to happen.

Aeration chamber 

The second chamber, and also the one that accounts for a critical part of the treatment. It is what sets these types of systems apart from their conventional predecessor. 

Settling chamber or clarifier 

The settling chamber sits between the disinfection system and the pump tank. Among other reasons, the clarifier is critical to the whole system because it collects the purified water required to be sent to the pump tank for dosing into the land application system.

Before the settling chamber, the wastewater is not in the conditions required for utilization and so the third chamber is where the most critical transition is made. It removes the bacteria and the pathogens considered to be harmful to the system and the people depending on it.

Pump Tank

This is the fourth and the last chamber disposed of in the interior of the aerobic septic system. It is responsible for conducting the transportation of the effluent according to pre-determined dosing preferences. 

The Wastewater is held inside of the pump tank until it hits one of the benchmarks set to flush the water through the sprinklers and reset the loop. Similarly to the discharge mechanism of your toilet.

Although both in your toilet and the pump tank, the benchmark signals a High-Water Level (HWL), the response is different. In your toilet, a High Water Level signal prevents the cistern from overload. In the pump tank, it triggers the sprinklers. 

Although triggering the sprinklers indirectly prevents the pump tank from overload, the immediate response following an HWL signal is different. In a pump tank, there may be different benchmarks, all of which in exclusion to the most superficial one, do not prevent water inlet.

Now that we know what is inside the structural setting of your aerobic septic system, let’s dedicate some time to evaluate how that benefits you.

The aerobic septic process | Nortex Septic Designs 

To keep things in context, here is a quick correlation between the stages of treatment and each of the chambers disposed of in the interior of an aerobic system. 

If you would like to learn more about the process occurring inside of each of those stages, please read our blog about the aerobic process.

Stage one: Trash Tank

Stage two: Aeration Chamber

Stage three: Clarifier or settling chamber

Stage four: Pump tank

Septic design and inspections in Texas | Nortex Septic

If you are located in the Dallas-Fort Worth Metroplex, we are happy to inform you that we can take on your septic system design, installations, and inspections. 

All you have to do is make sure that you are calling us from the any of the following counties in the Dallas-Fort Worth Metroplex:






In the case that you are reading us from a different county or state, there is no need to panic, just pick up the phone, get in touch with us and let us see if there is something we can do for you. We will evaluate your case and either take care of your septic requirement on ourselves or help you find an equally capable septic professional near your area.