If you own a home with a septic system, you know how crucial it is to maintain its health and functionality. One often overlooked but essential component of this system is the septic filter. Understanding what a septic filter does can help you appreciate its role in keeping your septic system running smoothly and prevent costly repairs.

What is a Septic Filter?

A septic filter, often called an effluent filter, is a device installed within the septic tank, usually at the outlet pipe. Its primary function is to trap and filter out solids and debris before the effluent (wastewater) exits the tank and flows into the drain field. By doing so, it protects the drain field from clogging and extends the life of your septic system.

How Does a Septic Filter Work?

The septic filter is typically a cylindrical plastic device with slots or mesh designed to capture larger particles. Here's a step-by-step breakdown of its operation:

1. Wastewater from your home flows into the septic tank. Here, solids settle at the bottom (forming sludge), and lighter materials like grease and oils float to the top (forming scum).

2. The liquid layer in the middle, known as effluent, flows toward the outlet pipe. Before it can exit the tank, it must pass through the septic filter.

3. As the effluent passes through the filter, solids and debris are trapped. Only relatively clear water continues through the outlet pipe.

4. he filtered effluent then moves on to the drain field, where it undergoes further treatment and absorption into the soil.

Benefits of a Septic Filter

  • Prevents Clogging: By trapping solids, the filter helps prevent the clogging of pipes and the drain field, which is crucial for maintaining system efficiency and avoiding backups.

  • Extends Drain Field Life: A well-maintained filter ensures that only clear effluent reaches the drain field, reducing the risk of soil clogging and extending the life of the drain field.

Maintenance of a Septic Filter

Regular maintenance of the septic filter is essential to keep your septic system functioning properly. Here are some maintenance tips:

  • Clean the filter whenever you have your septic tank pumped, or more frequently if needed. This typically involves removing the filter and hosing it off to remove trapped solids.

  • If you’re not comfortable inspecting or cleaning the filter yourself, give Henson Septic Services a call. We can also check for other potential issues in your septic system while we are there.


A septic filter is a small but vital component of your septic system. By trapping solids and preventing clogs, it plays a crucial role in protecting your drain field and extending the life of your septic system. Regular maintenance of the septic filter can save you from costly repairs and ensure your system operates efficiently. So, next time you think about your septic system, remember to give a little attention to the hardworking filter that keeps it all flowing smoothly.

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