What is the filtration rate in GPM/ft² if a filter that is 24 ft by 28 ft receives a flow of 3,250 GPM?

• A. 3.2 GPM/ft²
• B. 4.0 GPM/ft²
• C. 4.8 GPM/ft²
• D. 5.5 GPM/ft²

Answer: (C)

To determine the filtration rate in GPM/ft², one must first calculate the area of the filter and then divide the total flow by that area.

The dimensions of the filter are given as 24 feet by 28 feet. The area can be calculated by multiplying these two dimensions:

Area = Length × Width = 24 ft × 28 ft = 672 ft².

Next, the total flow is provided as 3,250 GPM. To find the filtration rate in GPM/ft², divide the total flow by the area of the filter:

Filtration Rate = Total Flow / Area = 3,250 GPM / 672 ft² ≈ 4.83 GPM/ft².

When rounded, this value corresponds closely to 4.8 GPM/ft², making it the correct choice. This calculation shows how the flow relates to the size of the filter, which is crucial for understanding filter performance and efficiency in water treatment systems. The rate indicates how effectively the filter can process water based on its surface area.