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various combinations of exogenous and marine infiltrated waters with
magmatic-endogenous waters (presence of radon and thoria as well as
other elements), which are the essential prerogative of the thermal
waters on Ischia, derive from this outline. Waters that are all considered
to be the most radioactive in Europe. Moreover, their chemical composition
varies according to the nature of the terrane. One can distinguish
between chloride-sodium waters with about 75 springs in the territories
of Ischia Porto, Lacco Ameno and Casamicciola, and bicarbonate-alkaline
waters with about 20 springs in Casamicciola and Barano. The
difference in composition and temperature allows for various clinical
applications and the current thermal establishments definitely possess
a therapeutic specialization in relation to the different qualities
of the waters and are consumed on a national and international level.
Even from the brief above-mentioned notes, it can be seen that through
the nature, the quality and quantity of the hydrothermal resources
on Ischia, the transformations that have concerned the Island can
be interpreted through the particular characteristics assumed by tourist
development with the establishment of curative thermalism. Known since
ancient times and relaunched during the nineteenth century among the
elite, the activities connected to the exploitation of hydrothermal
resources have recently become a decisive factor in the Island's economic,
social and settlement transformation.
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