What is a desirable characteristic of filter media?

A desirable characteristic of filter media is that it should be hard and durable. Durable filter media can withstand the physical and chemical stresses during the filtration process, which ensures longevity and consistent performance. The hardness of the material contributes to its ability to maintain its structural integrity under pressure and during the backwashing process, which is crucial for effective operation in a water treatment facility.

In contrast, softer materials may wear down quickly or become compacted, diminishing their effectiveness. Lightweight materials may not provide the necessary weight for adequate sedimentation or prevent resuspension of particles. Additionally, while cost is a factor in material selection, a focus on cheap and disposable options may lead to poor filtration performance and increased operational issues over time. Flexibility and pliability could hinder the effective functioning of the filter media, as they are not suitable for the consistent and stable conditions needed for reliable filtration. Thus, hard and durable media directly contribute to the efficiency and reliability of the filtration process in drinking water treatment.