Which statement about grease traps or interceptors is incorrect?

The statement that is marked as incorrect accurately describes a misunderstanding about the nature of the solids that grease traps or interceptors typically handle. Grease traps are primarily designed to capture fats, oils, and grease (FOG) that accumulate from food establishments. While they do catch some solids, these are predominantly grease and related food particles, which can be both settleable and non-settleable depending on their composition and the specific conditions within the trap.

In most scenarios, the solids present in grease traps often include materials that can settle, such as food debris, which can clog the system if not properly managed. The presence of non-settleable solids (like smaller particles that remain suspended in water) may not be as significant compared to the settleable solids that grease traps are primarily dealing with. Therefore, stating that most solids are non-settleable is misleading, as grease traps are expected to collect a fair amount of settleable debris.

The other statements about grease traps or interceptors highlight their fundamental purpose and operational requirements. They are essential in minimizing the grease entering wastewater systems, they do require regular maintenance to function properly, and they play a crucial role in preventing sewer line clogs by intercepting and retaining grease before it can cause drainage issues in the