Which filtration type relies on centrifugal force to separate solids from liquids?

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

Answer: (B)

Filtration by centrifugal force relies on spinning the liquid to generate strong outward accelerations. As the fluid rotates, denser solids tend to move toward the outer wall while the clarified liquid stays nearer the center, allowing separation without needing a fine pore barrier. This separation mechanism is what defines centrifugal filtration.

In irrigation, this means solids are driven out of the liquid stream by the rotational forces and collected for disposal, rather than being trapped by a screen, disc stack, or granular media. The other filters rely on physical barriers—the pore size of screens or discs, or the depth of a media bed—to block or capture particles as water passes through under pressure. That difference in mechanism is why centrifugal filtration is the correct choice here.