- A spring water does not have to have a constant chemical composition.
- A natural mineral water needs to have a constant chemical composition over a course of time (in particular during a complete water cycle of around 1 year).
- A spring water does not have to have a constant exit temperature.
- A natural mineral water needs to have a constant exit temperature over the course of time.
As a result, the taste and mineral content of a spring water can vary considerably.
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