Sounds like good tap.
Ca hardness is alkalinity or KH, so 63 ppm of KGH, to get degrees, divide by 17.86.

63/17.86= KH
106/17.86 = GH also for GH.

Use only the the KH for pH/CO2 etc.
Also, see the drop checker method for CO2 measure.


Regards,
Tom Barr