I thought something was amiss with your original sodium and sulfate, good to see its pretty workable after all.
Martin, If you catch this post I was wonder about something in his Ward Labs report.
It is a lab so I am certain they would be accurate on stuff like this, but looking at the reported total alkalinity of (75) I am to understand that would translate to a HCO3 of around (91.5) not a lower number like (28).
From what I have always known and to find my own HCO3, I use my utility’s total alkalinity of lets say last months 59 ppm I would then times this amount by 1.22 to find my HCO3 which would then be 72 ppm. Which when checked against my current tap PH and the utility’s reported alkalinity in Bru N water the spreadsheet always shows me this 1.22 method is correct as it agrees within a point or two usually.
Is there something I am missing and/or mis-calculating or is the wards lab report incorrect?
Is it the PH of his supply being around 10.0 or something as I have a tap PH around 8.0-9.0 in most cases and maybe that is part of the story I am missing?