Frequently Asked Questions


Grease traps prevent grease from entering the sewer system. This avoids that the local sewage treatment plant would have to remove excess of grease from pipes.  

By not installing a grease trap, grease residues will end up in the sewer system. By letting this happen, you run the risk of heavy fines from the sewer company. 

A grease trap is a device that intercepts and stores grease before entering a wastewater disposal system.

This would depend on the regulations from your local sewer district. We recommend that you check your city’s regulations. Most common businesses are restaurants, food services, distribution centers, schools, hotels, casinos, resorts, grocery stores etc.  

Grease is formed from food residues left on dishes and cookware after use. 

In order to prevent blockages of the sewer system due to accumulated grease, oils and fats discharged from food facilities, many wastewater treatment agencies require the installation of grease traps. Every restaurant serving any type of greasy food or baked goodies (baked on premises) needs a grease trap. 

Grease will stick to the inside of the pipeline. This causes blockage which can cause the pipes to break. 

Grease trap

No. Our grease traps are not designed to be pressurized. The in-and outlet of the grease trap has to be plugged off before pressurizing the sewer pipes for testing.  

No, we do not recommend the use of a sediment bucked inside the grease trap because the grease will stick to the solids. We suggest you install one of our solid interceptors upstream to the grease trap. 

The flow rate of your grease trap model is determined with a capacity calculation according to your kitchen equipment. After this calculation has been done, most of the time more kitchen equipment cannot be added. Adding more kitchen appliances may not allow the grease trap to handle the capacity and therefore will not function properly. If you want to add more kitchen equipment to your grease trap, first contact our customer service to find out if this is possible.     

No. Our grease traps do not rely on any kind of chemical/enzyme. We do not recommend the use of these harmful additives. 

Our sales department can help you pick the right size for your grease trap. Please contact to learn more about this.

If you are planning to expand your kitchen equipment in the future, we recommend installing a larger model beforehand.  

If you want to add more kitchen equipment, first contact our customer service to see if your grease trap can handle the capacity. If this is not possible, a second grease trap needs to be installed or the current one needs to be replaced. 

Our grease traps are produced from HDPE, which is a unique thermoplastic distinguished by its strength. This material is resistant to oil, fats, grease and other chemicals and is highly durable with a lifespan for over 50 years. The steel reinforcement frames ensure durability and last you many years into the future.




Food debris is a source of odor and it is mandatory to regularly clean and empty the grease trap. Also refer to the manual for proper ventilation and installation of the unit.

The grease capacity listed on our spec sheet is a working capacity. It represents the total amount of grease that can be held by the separator before the turbulence of the water forces grease through the unit.

The outlet vent needs to be vented to the facility vent or code-approved vacuum breaker to prevent siphonage.

A grease trap can be installed both underground or above ground, depending on the model. What is important is that the grease trap is installed as close as possible to the fixture(s) it is serving. The grease trap should be visible and accessible for maintenance and inspection and always be installed frost free. When installed below sewer level, a pump installation must be installed. It is mandatory to install the grease trap according to the instructions in our manual. 

Rotting food contained within a grease trap breaks down, producing toxic waste such as gases and acids. This attacks steel and concrete materials, resulting in “rot out”. On the other hand, HDPE has acid-resisting properties. Our grease traps have an extra thick wall of 1/2 inch to ensure an extra long life.

Flow control

Yes, the Go-Sep flow control can be buried in the ground. However, we recommend that the flow control is easy accessible for maintenance purposes. A good solution for this is to install the flow control in an inspection pit. Please consult your local code to ensure the installation complies within your code.

Installing a flow control device is required by the PDI. We recommend to follow local and states plumbing codes.

A flow control limits the separator to its rated capacity allowing enough time for the grease separation to take place inside the unit. 

Flap valves

Both the GFV-W and the GFV-T are designed for wall mounting. However, the GFV-T is provided with an angle, creating a 100% tight seal. The GFV-T is also more suitable for tidal situations since it is more resistant to waves. 

Vent valves

The GDV model is designed to allow water and air to pass through. This makes this model more applicable in situations with a lot of water discharge. The GVV model is also equipped with a water drain. However, this one is small and gets clogged more easily.



GDV = Lots of water drainage

GVV = Little water discharge


Go-Sep offers a wide range of manualsproduct sheets and dimensional DWG files, which can ben found or requested on our website. If specific formats are preferred, feel free to contact our customer service and we will see what we can do for you. 

Delivery & returns

We take great care of your order. However, it is possible that an item arrives in damages condition or you receive the wrong product. In this case please contact our customer support.

Yes, it is possible to have products delivered urgently. Contact our customer support during working hours for the possibilities and any additional costs.