If high-quality water is applied to filters and run times are long, what problem might arise?

• A. Biofilm growth
• B. Floc breakthrough
• C. Air binding
• D. Insufficient backwash

Answer: (B)

Applying high-quality water to filters for extended periods can lead to floc breakthrough. This occurs when the filter media is unable to effectively capture and retain particles suspended in the water, especially if the incoming water quality changes or has minimal particulate load over time. High-quality water typically has lower concentrations of suspended solids, which may contribute to a condition where fine particles or floc that normally would be captured by the filter are allowed to pass through, as the filter becomes less efficient at removing these contaminants.

In the context of long run times, the filter may become less effective at removing even those particles that would typically be retained, resulting in breakthrough. This is particularly critical in a water treatment process, as it indicates a potential failure in the filtration system that could affect water quality. The issue of floc breakthrough emphasizes the importance of monitoring filter performance and regularly evaluating backwash operations to maintain optimal filtration efficiency.