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According to my copy of "Malts and Malting" - D. Briggs... pg. 190 an analysis of the ash of a certain malt (or maybe just the unmalted grain) contained .46% potassium, .24% phosphate, .14% magnesium, .037% calcium, etc... but on the following page a different analysis (apparently) the malt...

What you're trying to say is that the excess HCL and H2S04 ions in the strike water (those that don't have any calcium, etc... ions to react with) simply hang out in solution until dough in and when the malt releases it's ions to the solution the HCL and H2S04 react with the calcium, etc... from...

Agreed, but what if one desires to add high levels of Chloride or Sulfate with low to no calcium or magnesium?

I've done this in the past and have made good beer, starting with deionized water: 1.) Add Calcium Hydroxide and/or Sodium Bicarbonate to strike water to achieve Calcium and/or Sodium ion levels. 2.) Add HCL and/or H2S04 to strike water to achieve Chloride and/or Sulfate levels. 3.) Heat to...

You may be interested in reading about the SRM model and how it was developed: Effect of Water and Grist on mash pH It would be interesting to know the models each spreadsheet uses: EZ Water (?) Bru N Water (?) Brewers Friend (?) Mash Made Easy (?) NUBWS (Nearly Universal Brewing Water...