What is the main function of mechanical filtration in water treatment?

The primary function of mechanical filtration is to remove physical particles from water. This process involves using barriers, such as screens or membranes, to separate solid contaminants like dirt, sediment, rust, and other particulates from the water. By effectively eliminating these suspended solids, mechanical filtration improves both the clarity and quality of the water, ensuring that it is cleaner and potentially more palatable for consumption and use.

Other options do not align with the main role of mechanical filtration. For instance, dividing water into components or enhancing chemical reactions pertains to more specific processes, like ion exchange in water softening or chemical treatment methods. Measuring water flow resistance is related to assessing the performance of a filtration system, but it is not a direct function of the filtration process itself. Thus, the focus on removing physical particles is what distinguishes mechanical filtration as a critical step in water treatment.