CITY OF MANSFIELD'S UTILITIES DEPARTMENT
WATER TREATMENT PROCESS (Continued)
The settled water then passes through a system of tube settlers that settle any of the coagulant that was not removed in the settling basin, and the clarified water is collected in launders that flow to the top of the filtration system. This stage is called settled water.
The settled water then passes through a granular activated carbon filtering unit. After the water passes through the filter system it is totally enclosed and protected from outside contamination. This stage is called filtration.
After filtration the pH of the water is adjusted to prevent scaling and corrosiveness. Fluoride is added to help prevent tooth decay, and the water is disinfected with chlorine.
The filtered water is stored in large tanks called clear-wells. Storing the water in these tanks prior to distribution allows the final disinfectant contact time with the freshly filtered water.
The disinfection residual in municipal drinking water helps to insure the safety of the drinking water as it is pumped away from the treatment plant and throughout the water distribution system. This stage is called finished or drinking water.
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