What factors must inspectors have a basic understanding of?

Inspectors must have a comprehensive understanding of various scientific principles to effectively evaluate and manage wastewater treatment systems. This includes knowledge of biological reactions, which are crucial in understanding how microorganisms interact with wastewater to break down organic materials. Additionally, familiarity with chemistry and chemical reactions allows inspectors to comprehend how different substances in wastewater interact and the implications for treatment processes.

Understanding manufacturing processes is also important, as these can influence the types and concentrations of pollutants that enter the wastewater system. Lastly, having insight into their own collection and treatment system ensures that inspectors can accurately assess its functionality and identify any areas for improvement or concern.

Therefore, the correct choice encompasses all these vital areas necessary for effective inspection and management of wastewater treatment systems.