Cristaline in Tunisia EMT produces and distributes a mineral spring water bearing the Cristaline trademark . The product's characteristics make it one of the best waters on the Tunisian market with a calcium and magnesium content well over the average. Selecting the spring After having carried out several investigations, EMT selected Zaghouan which is a renowned city for its water as it had supplied Carthage with water from its excellent quality springs emerging from the mountainous structures of Jebel Zaghouan . The Jebel Zaghouan is a complete structure belonging to the Tunisian ridge. With its altitude of 298 meters, it represents the peak of Northern Tunisia. It is a calcareous massif dating back to the Jurassic age, it is a highly tectonic ridge made up of several high points , the most important one being Jebel Stah.