Your grease interceptor plays a critical role in your facility’s function which means it needs some TLC on a regular basis.  By not properly servicing it you are opening your facility to health code violations, unsanitary conditions, emergency services that cut into your bottom line, and headaches.

Here are 4 common causes of grease interceptors backing up:


  1.  Crossover Clog


Grease interceptors work by guiding fats, oils and grease (FOG) through two compartments.  FOG, food waste, and water is separated in the first chamber, and then the waste is pumped into the sewer from the second chamber. The two chambers are connected by a crossover T-pipe. A clog in the T-pipe will cause the liquid level in the first chamber to become elevated as the waste wont flow properly through to the second compartment.


  1. Incoming Line Clog 


This type of clog will stop your entire system from functioning.  An incoming line clog is caused by an excessive buildup of fat, oils, grease, and debris in the line. The blockage line will cause the location’s lowest plumbing fixture to backed up such as a floor drain.


  1. Outgoing line Clog


This type of clog is the easiest to identify and can cause quite the mess in your parking lot due to it causing both chambers to overflow leading to greasy water spewing out of the manhole cover.  The root cause could be either a blockage in the outgoing line or the city main. However, if you’re not properly disposing your wastewater on cycle the clog may be your fault.


  1. Full Grease Trap

When FOG from the main compartment is not pumped regularly your grease trap becomes full. Once it is full the waste from the first chamber will spill over to the second chamber and begin wreaking havoc by causing clogs in the crossover, incoming and outgoing lines.


The best ways to prevent these problems is to have your trap pumped and cleaned on a recurring basis.  You also want to have preventative jetting for your inlet and outlet lines.  The cost of the preventative maintenance is significantly less than the cost of emergency services.

Call SLM to set up a preventative maintenance program today Just. Like. That! 888.847.4449 or email at



Article Written By Brett Potoka