A typical problem with fine screens is that they may accumulate __ __, causing the screen to become blocked

• A. Sediment
• B. Algae
• C. Bacteria Film
• D. Slime Growth

Answer: (D)

Fine screens tend to clog because a slimy biofilm forms on the screen surfaces. Microorganisms and organic matter accumulate and produce a sticky slime that coats the openings, reducing the free area and blocking flow. This slime growth is the most common and troublesome fouling mechanism for fine screens, more so than simple sediment buildup or other types of microbial films. Regular cleaning or backwashing is needed to remove this slime and keep the screen from becoming blocked.