Question

When a filter wash is uneven, the spots violently over-washed might result in:

a) Short-circuiting
b) Media fouling
c) Improved filtration
d) Reduced backwash frequency

Answer 1

When a filter wash is uneven and spots are violently over-washed, it can result in media fouling.

Step-by-step explanation:

When a filter wash is uneven and the spots are violently over-washed, it can result in media fouling.

Filter media fouling occurs when the filter media, such as sand or activated carbon, becomes clogged or contaminated. This reduces the effectiveness of the filter in removing impurities from the water during filtration. Uneven washing can lead to areas of the media being over-washed, causing a disturbance that can result in fouling.

To illustrate, let's consider a sand filter used in a swimming pool. If certain areas of the filter bed are over-washed while others aren't washed enough, those over-washed spots could become more compacted and clogged with debris, reducing the overall flow of water through the filter and compromising its efficiency.