The lime adjusts 7
the pH and the Alum begins the process of attracting foreign particles that are too small to
be filtered. The particles come together with the Alum forming larger particles that
eventually sink to the bottom or can be filtered out. Inside a lab, a technician can run a test
that simulates the rapid mix tank to determine the correct amount of Alum needed for the
particles called floc to form. From the rapid mixed tank, water then flows into the first of
two flocculation basins, where the water’s motion is reduced allowing the floc particles time
to form larger particles. As time progresses, the particles get heavier and begin to sink to the
bottom. As the particles are sinking the water flows into sedimentation basins