Grease Interceptors | Bigger Isn’t Always Better

Endura grease interceptor cutaway 7-50 GPM

The sewer systems in cities around the world are facing a crisis; a fat, oil and grease crisis.

Also known as FOG, fats, oils and grease are damming up sewer lines and costing municipalities millions to manage. Pipes are breaking, drains are backing up and sewage is finding its way into water systems and basements.

Reducing and eliminating the presence of FOG in the food industry wastewater has become a mandate of most municipalities, and grease interceptor technologies (GIs) have become the solution. This is where plumbers, contractors and specifiers all play an important role in the long-term viability of our sewer systems and the health of our waterways.

Types of Grease Interceptors

There are two main types of grease interceptors: the Gravity Grease Interceptor (GGI) and the newer Hydromechanical Grease Interceptor (HGI). Both of these technologies use gravity to separate grease from wastewater, where grease rises to the top for removal. 

gravity grease interceptor vs. hydromechanical grease interceptor

The advancement of HGIs has exposed some of the shortcomings of the more traditional GGI. GGI is a technology that has been around since the late 1800s and uses a passive method to separate grease from wastewater. FOG-filled wastewater flows freely into the GGI and is slowed as it enters a reservoir chamber. These units are large and are generally made of concrete, which is susceptible to microbial corrosion (MIC). This results in structural failure and untreated wastewater seeping into groundwater. 

HGIs are designed to be much easier to manage. Their smaller size enables them to be installed and maintained both inside and outside the building. This makes routine maintenance much easier and safer. Despite their size, HGIs are far more efficient at handling FOG than GGIs. A 1000 gallon GGI holds the same amount of FOG as a 250 gallon (100 gallons per minute) HGI. The major difference between the two is their water-to-grease capacity. Most municipalities require GGIs to be emptied at 25% grease capacity; whereas an HGI’s grease content can be as high as 75%. This is because HGIs are certified by third-party laboratories to maintain high separation efficiency, even under gruelling conditions. 

Endura's line of HGIs

The HGIs developed by Endura® Grease Management are the first in North America to be made with thermoplastic injection moulding. Not only are they lightweight, but their seamless design greatly reduces the potential for leaks and is easier to maintain. Thermoplastic is also less susceptible to corrosion. This durability means they are capable of withstanding wear, tear or decay over a long lifetime, far exceeding their metal and concrete competition.

The need to greatly reduce the presence of FOG in our wastewater is almost universally recognized. New mandates set by local building codes require it as well. Fortunately, HGIs are an efficient and cost-effective solution. Installation and maintenance are far easier than its GGI predecessor; but most importantly, the FOG separating performance is exceptional.


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