The grease interceptor has been in use since the Victorian era as a means to reduce the amount of fats, oils and grease, or FOG, that are introduced into sewer systems.
Since that time, the production methods, materials and efficiency of these products have significantly advanced. GIs are now required in most jurisdictions to be installed at any food service establishment. In areas where the authority having jurisdiction has required FOG-producing fixtures to discharge into a GI, the plumbing code states that the interceptor must be certified to one of the following standards: ASME A112.14.3, ASME A112.14.4, CSA B481, PDI G-101 or PDI G-102. These standards prescribe performance criteria and in some cases, design criteria, that the GIs must meet. They also use the same basic test method for determining efficiency and performance. In addition, CSA B481 includes material, hydrostatic and load/structure requirements.