What term describes the speed at which water passes through a filter?

The term that describes the speed at which water passes through a filter is flow rate. Flow rate specifically measures the volume of water that moves through a filter over a specified period, usually expressed in gallons per minute (GPM) or liters per minute (LPM). It is a critical parameter in water treatment and filtration systems because it affects the efficiency of the filtration process and the system's overall performance.

Understanding flow rate is essential for technicians to ensure that water treatment systems meet the specific needs of their application and can effectively remove contaminants while maintaining adequate water pressure. In contrast, the other options, such as pressure rate, velocity rate, and current rate, do not accurately represent the concept of how much water is flowing through the filter over time, which is why they are not the correct terms in this context.