How do you calculate filter surface area in square feet?

To calculate filter surface area in square feet, the correct method involves dividing the flow rate by the filter rate. This approach stems from the formula used in pool filtration systems which considers the amount of water flowing through the filter and the rate at which the filter can process that water.

The flow rate refers to the volume of water passing through the filter per unit of time, usually measured in gallons per minute (GPM). The filter rate indicates the efficiency of the filter, determining how many gallons per minute can be effectively filtered per square foot of filter surface area. By dividing the flow rate by the filter rate, you derive the necessary surface area needed to maintain optimal filtration without overloading the system. This calculation ensures that the filter can adequately handle the water being processed, promoting proper filtration and water clarity in the swimming pool.

The other choices involve calculations that do not yield the surface area and could lead to incorrect interpretations of filter capacity or performance.