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Since ancient times, the Greeks and Romans praised the medicinal benefits of sea water.
In modern times, Richard Russell (1750) started to use sea water medicinally – drinking and baths – in Brighton. His promising results attracted the Court; and thanks to that, Brighton became a city instead of being a fishermen’s village.
you can read on-line his famous book "A Dissertation on the Use of Sea-Water in the Diseases of the Glands. Particularly the Scurvy, Jaundice, King's-Evil, Leprosy, and the Glandular Consumption. Translated from the Latin of Richard Russel, M. D." in google books.