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				| 1. | 
                                    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 | 
| Answer» C. 76 gallons per square foot per day | |