Which layer in a multi-media filter is responsible for filtering out the largest particles?

In a multi-media filter, the anthracite layer plays a crucial role in filtering out the largest particles. Anthracite is a type of coal that has high carbon content and is known for its hardness and durability. When used as a filtration medium, it is positioned typically on the top layer of the multimedia filter because of its ability to capture larger suspended solids and debris from the water. Its larger particle size and void space allow for significant sediment removal, which is essential for preventing clogging in the lower layers of the filter system.

As water passes through the anthracite layer, the physical properties of the material enable the effective trapping of larger particles before they reach the finer filtration media underneath, which are designed for smaller particles and contaminants. This layered approach enhances the overall efficiency of the filtration system, ensuring that the treated water meets the necessary quality standards.

Other filtration media in the filter also serve important purposes, but each is optimized for different particle sizes. Therefore, the anthracite layer is specifically designed to handle the largest particles in the filtration process.