What action contributes to the prevention of head loss buildup in filtration media?

Maintaining media uniformity is essential in preventing head loss buildup in filtration media. When the filter media is uniform, it allows for an even flow of water through the filter, minimizing areas of low flow or channeling that can occur if the media varies in size or type. This uniformity ensures that particles are effectively captured throughout the media rather than just in localized areas, which can lead to clogging and increased head loss.

In contrast, options related to changing flow rates or inflow pressure are more likely to create uneven conditions in the filtering process. For example, increasing flow rates might lead to a higher velocity through the media, causing disturbances that could lead to irregular flow paths and subsequently contribute to head loss. Similarly, decreasing the wash-water trough level may not sufficiently clean the media to prevent head loss, and reducing inflow pressure could slow down the process, which does not directly address media uniformity issues. Thus, maintaining a consistent and uniform media directly supports effective filtration and helps prevent the buildup of head loss.