This section is from the book "A Treatise On Beverages or The Complete Practical Bottler", by Charles Herman Sulz. Also available from Amazon: A Treatise On Beverages.
The proper method in the process employed for the imitation of the composition of natural water should be to imitate as closely as possible, and to attain this end it is necessary, as nearly as may be, not to omit any of the elements found by analysis, provided they can be kept in solution. For the imitation of a particular water it is also necessary to take as a guide those analyses which are most trustworthy. Carbonic acid is an agent capable of dissolving a large number of saline compounds, especially when the latter are found in the state of hydrates or recently precipitated, as already explained. Thus carbonates of lime and magnesia, carbonates of iron and manganese, calcareous phosphates and sulphates, earthy silicates, etc., dissolve readily in carbonic acid, provided they exist in a hydrated condition, that is, combined with water; and to procure them as far as possible in this state is the purpose of the artificial combinations given hereafter, the components of which are grouped together to act by double decomposition in the liquid itself, and to yield upon combining the same components and in the same proportions as revealed by the analysis. If directions are closely observed in respect to the preparation of the solutions, and the water well charged, the product will be found satisfactory.
Mind that, as far as possible, the components should be introduced in form of diluted solutions, each group dissolved and mixed separately, and each separate solution added in the order indicated, as it is important that the combination is made in accordance with the known chemical principles.
The agitator is turned slowly to thoroughly mix the solution and promote the chemical combination of the substances while they are added. Artificial mineral waters are generally impregnated with from 2 to 5 volumes of carbonic acid gas, or from 30 to 75 pounds. When intended for export to tropical climates do not charge higher than 45 pounds.