Which of the following is NOT a common test for establishing coagulant dosages?

The correct answer, which identifies a factor that is not commonly tested for establishing coagulant dosages, highlights the role of turbidity, pH, and raw water temperature as primary parameters during the coagulation process in water treatment.

Turbidity is a crucial measurement because it indicates the cloudiness or haziness of water caused by large numbers of individual particles. The levels of turbidity help determine the appropriate coagulant dose, as higher turbidity levels typically require a higher dose to effectively clump particles together for removal.

pH is another essential factor, as it influences the charge and solubility of the coagulants used. Different coagulants work best within specific pH ranges, so testing pH is important for optimizing coagulation and ensuring effective treatment.

Raw water temperature also plays an important role in determining coagulant dosage. Temperature affects the kinetic energy of water molecules and the behavior of particles in suspension, which can influence coagulation efficiency. Thus, it’s necessary to account for temperature when establishing coagulant dosages.

Color analysis, although it can provide information about water quality and potential treatment needs, is not routinely practiced for establishing coagulant dosages. It's primarily used to assess the aesthetic quality of water rather