Calculate the fast rinse flow of the regenerant liquid for a softener with the below given data.Magnesium Load: 10 ppm as CaCO3Capacity: 47 Kg/m3Correction factor: 0.9Flow rate: 135 m3/hrOperation hours: 20 hrs

• A. 4.5 m3 /hr
• B. 7.2 m3/hr
• C. 1.7 m3 /hr
• D. 7.5 m3/hr