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Accurate monitoring of deep aquifers is one of the challenges with CO 2 Storage surveybut this challenge is not restricted to this thematic. Pumping deep waters is often not appropriate as it requires high amounts of water to be purged. Therefore deep sampling is often performed. Several devices exist; the simplest ones are based on the lowering of bottles with opened valves that are closed at the targeted depth. Improvement comes with bottles that are only opened at desired depth, or withdoi:10.1016/j.egypro.2017.03.1512 fatcat:fs7ksqbef5b6zfckqlx7z5lyji