The average hardness of a groundwater is 550 mg/L as CaCO3. The cation exchange process will be used to lower the hardness to 100 mg/L as CaCO3. The selected cation exchange resin is in the sodium form and has an cation exchange capacity of 100 kg of hardness as CaCO3/m3 of CATIONEX resin when operated at a liquid loading rate of 1.0 gal/min-ft2 . The water treatment plant processes a flow of 100m3 /hr. (Hint: 100% of hardness is removed from water passing through the CATIONEX) Determine: (a) The volume of Cation Exchange Resin needed per day. (b) The total surface area of CATIONEX needed at the specified liquid loading rate.