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Changes in Mineralisation
The mineralisation of a water changes slightly over time. Usually, this change is not much, but the imporance of clean water for drinking is enough to warrant constant monitoring. Analysis of the water must be conducted every couple of years.
Below is an example of the development of some minerals over time for the Swiss water San Bernardino:
| Analysejahr | 1895 | 1899 | 1956 | 1960 | 1966 | 1976 | 1987 | 1997 |
| Acidity (pH) | 6.05 | 6.06 | 6.3 | |||||
| Calcium (Ca++) | 715 | 718 | 720 | 696 | 694 | 701 | 702 | 663 |
| Iron (Fe++) | 10 | 10.5 | 7.1 | 10.2 | 8.5 | 9.1 | < 0.005 | |
| Magnesium (Mg++) | 74 | 75 | 79 | 76 | 79.5 | 59.9 | 68 | 81.5 |
| Manganese (Mn+) | 1 | 1.2 | 0.6 | 0.6 | 1.1 | 1.2 | < 0.02 | |
| Sodium (Na+) | 16 | 16.1 | 18.6 | 15.6 | 16 | 17.5 | 16 | 14 |
| Strontium (Sr++) | 7.8 | 7.9 | 5.5 | 5.5 | 5.7 | 7.1 | ||
| Chloride (Cl-) | 4.7 | 4.5 | 5.5 | 4.6 | 4.5 | 5.3 | 5.3 | 4.65 |
| Hydrogencarbonate (HCO3-) | 1122 | 1059 | 1127 | 1122 | 1042 | 1016 | ||
| Sulphate (SO4--) | 1198 | 1202 | 1260 | 1140 | 1201 | 1140 | 1150 | 1125 |
Note that the water is cleaned from iron since a couple of years ago.
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