Chemical equation and calculation for remineralization system

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Dear all,

I am designing a remineralization system(Lime and CO2 gas injection to BWRO permeate ). So, our company received consultant from a vendor.

Below chemical equation and calculation had calculated from a  vendor.

However, we don't know how to calculate below data "As such required: 39.22, 46.64, 85.86", "Actual alkalinity produced: 47.567, 87.5675".

If you know well chemical equations and this calculation, please let me know how to calculate.

Thank you.   


Dose Calculation for Lime + CO2

                                                    Ca(OH)2 + 2CO2 = Ca(HCO3)2
                                                          74           88            162
As such required:                         39.22      46.64        85.86
As CaCO3:                                        53           53              53
Dosages as Such provided:           40           50          92.045
Actual alkalinity produced:                        47.567      87.5675