At what point in the water treatment process is clarity usually assessed?

Clarity in the water treatment process is most effectively assessed after filtration. This stage follows the removal of larger particles and suspended solids through various treatment processes such as coagulation and sedimentation. During filtration, water passes through sand, gravel, or other media, which significantly improves its clarity by trapping remaining particulates.

By evaluating clarity after filtration, operators can determine the effectiveness of these treatments and ensure that the water meets the required quality standards before it proceeds to disinfection stages like chlorination or ozonation. At earlier stages like before chlorination or during coagulation, clarity might not accurately reflect the quality of the water since additional treatment processes have yet to take place to improve clarity. This makes the assessment after filtration the most critical point for evaluating water clarity in the treatment process.