What does the uniformity coefficient measure in filter sand?

The uniformity coefficient is a critical parameter used to assess the size distribution of filter sand. It specifically quantifies the range of particle sizes present in a sand sample, indicating how well the particles are sorted. A lower uniformity coefficient signifies that the sand consists of particles that are more uniform in size, while a higher coefficient suggests a wider range of particle sizes. This characteristic is essential for determining the effectiveness of the sand as a filter medium, as it influences the sand's ability to retain suspended solids and provide adequate filtration.

Understanding the size distribution is vital because it impacts various filtration processes, affecting flow rates, filter operation times, and the overall efficiency of the filtration system. Therefore, measuring the uniformity coefficient helps operators select appropriate materials for water treatment and ensures optimal performance of the filtration system.