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Grease Trap Cleaning 101

Last Updated: October 21, 2025
Grease trap cleaning represented by a grease trap free of grime. ZTERS logo in the bottom right corner.

In the bustling world of commercial kitchens and food establishments, the unseen hero responsible for maintaining the health and longevity of plumbing systems is often overlooked—the grease trap. 

These unassuming devices play a crucial role in intercepting and trapping fats, oils, and grease (commonly referred to as FOG) before they have a chance to wreak havoc on drains and sewers. However, ensuring their optimal performance requires regular and diligent maintenance, specifically grease trap cleaning

In this post, ZTERS delves into the significance of grease traps, their functioning, and shed light on the essential practices involved in maintaining clean and functional grease traps.

What Is A Grease Trap?

A grease trap, also known as a grease interceptor or grease recovery device, is an essential component in kitchens designed to prevent FOG from entering the plumbing system. It acts as a physical barrier, capturing and separating FOG from wastewater, ensuring the smooth flow of liquid waste while preventing clogs, backups, and costly plumbing issues.

Here’s what a grease trap does best:

  • Intercepts FOG from wastewater
  • Prevents drain blockages
  • Protects plumbing systems
  • Protects the environment by filtering out harmful substances
  • Complies with health regulations
  • Extends the life of septic systems
  • Promotes hygiene and sanitation

How Does A Grease Trap Work?

A grease trap works on a simple yet effective principle of gravity and separation. When wastewater containing FOG enters the grease trap, it slows down, allowing the FOG to float to the surface due to their lighter density. Meanwhile, heavier solids settle at the bottom of the trap, leaving cleaner water in the middle.

The grease trap consists of different compartments or chambers that facilitate the separation process:

  1. The first chamber receives the incoming wastewater, allowing it to cool and slow down. As the FOG rises to the surface, it forms a layer of grease, which is then trapped by a series of baffles or screens. 
  2. The baffles prevent the grease from escaping into the outlet pipe, while still allowing the water to flow through. 
  3. The cleaner water passes through to the outlet pipe and continues its journey to the sewer or wastewater treatment plant.

Over time, as the grease trap fills up with FOG and solids, it requires regular maintenance and cleaning to ensure its effectiveness. Professional technicians, like those with ZTERS, can perform grease trap cleaning services, removing the accumulated FOG and solid debris from the trap, and restoring its capacity to intercept and separate FOG effectively.

What Is Grease Trap Cleaning?

If you’ve ever wondered what grease trap cleaning is, it’s the process of removing accumulated fats, oils, grease, and food solids from inside a grease trap to keep it working efficiently. Over time, these substances—often called grease trap waste—build up and reduce the trap’s ability to separate FOG from wastewater.

Regular cleaning restores the trap’s capacity, prevents unpleasant odors, and ensures compliance with local regulations. Professional grease trap cleaning typically includes pumping out the grease trap waste, scrubbing internal surfaces, and disposing of the materials at approved treatment facilities.

For most restaurants and commercial kitchens, grease trap cleaning is recommended every one to three months, depending on usage, to maintain consistent performance and avoid costly plumbing backups.

How to Clean a Grease Trap

Cleaning a grease trap is a task best left to trained professionals due to the nature of the job and the regulations surrounding the disposal of FOG waste. ZTERS adheres to protocols that ensure grease traps are properly cleaned. Here’s what the grease trap cleaning process looks like:

Inspection and Preparation 

A ZTERS technician begins by inspecting the grease trap to assess its condition and determine the appropriate cleaning method. They may also check for any signs of damage or malfunction that require repairs. Proper safety measures, such as wearing protective gear and ensuring proper ventilation, are taken before starting the cleaning process.

Pumping Out FOG and Debris

Using specialized equipment, a ZTERS technician will pump out the accumulated FOG and solid debris from the grease trap. This process involves removing the grease layer floating at the surface, as well as extracting the accumulated solids settled at the bottom of the trap. This step ensures the restoration of the grease trap’s capacity and functionality. The materials removed during this process are collectively referred to as grease trap waste, which must be handled and disposed of according to environmental standards.

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Thorough Cleaning and Scrubbing

After the bulk of the FOG and solids are removed, the ZTERS technician cleans the interior of the grease trap. They scrub the walls, baffles, and screens using appropriate tools and cleaning agents to eliminate any remaining residue and buildup. This step ensures the removal of grease that may have adhered to the trap’s surfaces.

Proper Waste Disposal

The collected FOG and waste materials from the grease trap must be disposed of in compliance with local regulations. The collected FOG and grease trap waste are transported to licensed facilities that specialize in treating and recycling fats, oils, and grease according to local environmental regulations.

Maintenance and Record Keeping

Once the grease trap is cleaned, the ZTERS technician may perform maintenance tasks such as inspecting and adjusting components, checking the trap’s functionality, and ensuring proper sealing. They also keep detailed records of the cleaning process, which may be required for compliance and documentation purposes.

What Could Happen If A Grease Trap Isn’t Properly Maintained?

Failing to properly clean a grease trap can lead to a range of adverse consequences and hazards, both for the plumbing system and the overall operation of a commercial kitchen or food establishment. The most common issues include:

  • The accumulation of FOG within the trap causes blockages in the drainpipes, leading to slow drainage or complete backups. This can disrupt daily operations, result in costly repairs, and potentially force temporary closures.
  • Neglected grease traps become breeding grounds for foul odors and bacteria, compromising hygiene standards and creating an unpleasant environment for staff and customers. Without regular cleaning, the excess FOG can bypass the grease trap, clog sewer lines, and contribute to sewer system overflows, polluting the environment and potentially violating local regulations. 
  • Lack of proper grease trap maintenance can strain septic systems, leading to system failures and the need for expensive repairs or replacements. 

Overall, neglecting grease trap cleaning can result in plumbing issues, health hazards, compliance violations, financial burdens, and reputational damage for businesses.

Key Takeaways

  • Grease traps prevent fats, oils, and grease (FOG) from clogging plumbing systems in commercial kitchens.
  • Regular grease trap cleaning is essential to maintain efficiency, prevent odors, and stay compliant with health regulations.
  • Grease trap waste includes FOG and solids that must be properly disposed of at approved treatment facilities.
  • Neglecting maintenance can cause drain blockages, sewer backups, environmental contamination, and costly repairs.
  • Professional technicians handle inspection, pumping, scrubbing, and record keeping to ensure full compliance.
  • Most restaurants and food establishments should schedule cleaning every one to three months depending on usage.

ZTERS Offers Expert Grease Trap Cleaning Services

ZTERS grease trap cleaning services take the burden off your shoulders, ensuring that your grease traps are meticulously maintained and compliant with regulations. Our team of experienced technicians employs industry-leading equipment and techniques to efficiently remove FOG and other grease trap waste, preventing clogs, backups, and costly plumbing issues.

Trust ZTERS to deliver reliable and convenient grease trap cleaning services, allowing you to focus on what matters most—running your business smoothly while staying compliant with environmental standards.