Residual Alkalinity =
Total Alkalinity (as ppm CaCO3) X (0.056)
- Calcium (as ppm Ca2+) X (0.04)
- Magnesium (as ppm Mg2+) X (0.033)
For example, Burton, and Munich have similar levels of alkalinity, but Munich has a much higher Residual Alkalinity.
The approximate levels of alkalinity...