Which type of filtration uses granular media such as sand or anthracite to remove particulates?

• A. Disc Filter
• B. Screen Filter
• C. Media Filter
• D. UV Filter

Answer: (C)

Filtration that uses granular media such as sand or anthracite removes particulates by passing water through a bed of layered granular material, trapping suspended solids within the depth of the media. This approach is known as media filtration, or multimedia/sand filtration, and is designed specifically around a bed of granular particles that physically capture contaminants as water flows through.

Disc filters rely on a stack of discs with closely spaced openings, and screen filters use a mesh screen to block particles. UV filters don’t physically remove particulates; they use ultraviolet light to disinfect water. Because the defining feature here is the use of a granular media bed to filter out solids, the correct choice is media filtration.