What is the flux of a membrane filter if it contains 75 sq. ft. of filter area and operates for 24 hours at a flow rate of 5 gpm? Assume that the water temperature is 20℃.

• A. 100 gallons per square foot per day
• B. 98 gallons per square foot per day
• C. 76 gallons per square foot per day
• D. 59 gallons per square foot per day