What is the main purpose of filter beds in the water treatment process?

The main purpose of filter beds in the water treatment process is to separate solids from liquids. During the filtration process, water passes through layers of sand, gravel, or other materials that trap and remove particulate matter, such as soil, debris, and microorganisms. This step is crucial in ensuring that the treated water is clear and free from suspended solids, which can affect its quality and safety for consumption. Filtration helps improve the overall integrity of the water by reducing turbidity and enhancing the effectiveness of subsequent treatment processes, such as disinfection.

In this context, other choices do not accurately describe the function of filter beds. The increase in water temperature is generally not a goal of filtration, while adding chemicals for taste typically occurs in different stages of treatment. Maintaining pH levels, though important for water quality, is managed through different chemical dosing processes rather than through filtration.