In water treatment, which of the following processes is used to achieve a clearer water quality?

Filtration is a critical process in water treatment that significantly contributes to achieving a clearer water quality. This technique involves passing water through various materials or filters designed to remove suspended particles, sediment, and contaminants. When water is filtered, larger impurities are trapped, which helps to clarify the water by reducing turbidity and improving its aesthetic qualities.

While coagulation is also an important water treatment process, it primarily serves to aggregate smaller particles into larger clumps (flocs) that can later be removed during subsequent filtration. Stirring, on the other hand, aids in mixing and distributing chemicals or materials but does not achieve clarity; rather, it can potentially keep particulates suspended. Purification encompasses a broader range of processes that may improve water quality but doesn't specifically refer to the removal of larger particles to enhance clarity in the same practical manner as filtration does.

Therefore, the role of filtration in physically removing impurities makes it essential for achieving clearer water quality in treatment systems.