The term fog refers to which of the following?

• A. Fat, oils and grease
• B. Fats, oils and grease
• C. Filtration, overflow, grease
• D. Floatable, oils, gases

Answer: (B)

FOG stands for fats, oils, and grease. This term describes kitchen-related lipids that accumulate in sewer lines, solidify, and cling to pipe walls, leading to blockages, odors, and sewer overflows. The plural “fats” is used to cover the range of fatty substances from different sources, including animal fats, cooking oils, and greasy residues. The other options don’t fit: “filtration, overflow, grease” mixes unrelated processes with grease, and “floatable, oils, gases” mislabels the third component as gases and uses an incorrect descriptor for the first. Understanding FOG helps explain why proper grease management, like grease traps, is essential in wastewater systems.