The technology in water filtration that uses several layers of different filter media for the removal of various contaminants from water is called a multimedia filtration system. These usually include materials like gravel, sand, anthracite, and garnet, which serve certain functions in filtering out particles of different sizes. Water travels successive layers in a sequence: larger particles are caught in the topmost layers, while finer particles are intercepted while water travels deeper in the filter bed.
The system is eminently effective in removing suspended solids, turbidity, and certain kinds of organic matter from the water. Multimedia filtration forms one of the major industrial, commercial, and municipal usages employed in water treatment to make water better for further processing or consumption. In fact, the design and selection of the media layers can be tailored to meet particular needs of water treatments, making it a very versatile and efficient approach to various filtration challenges.