Sedlec, or in our language "Zaječice" bitter water is one of the absolute legends of world pharmacy. For hundreds of years, it introduced magnesium sulfate into practical use, which is even called "Sedlitz salt" in the New World. This spring was also the most counterfeited spring of all time and the stories surrounding it are no less interesting. Come and take a closer look at the history of this Most medicinal spring, which has made it into encyclopedias all over the world.