A mixed media filter is often called an ________ filter.

A mixed media filter is often referred to as an "upside down" filter due to its design and arrangement of filter media. In this type of filtration system, different layers of media are stacked in a specific order to optimize the removal of various contaminants from water. The notion of "upside down" suggests that the media at the top is lighter and finer, while heavier and coarser materials are placed at the bottom. This configuration enhances the filter’s effectiveness by allowing for a more efficient flow of water through the media while capturing a broader range of particles.

In mixed media filters, the combination of different types of media can target specific contaminants, improving overall filtration efficiency. Such filters leverage the properties of varying materials to create a system that maximizes contact time and surface area, leading to superior treatment outcomes. Understanding this concept is critical for anyone involved in water treatment and ensures the selection of appropriate filtration methods for diverse water sources.