Oligocene water - composition and properties

Artesian water from the Oligocene period is a type of groundwater that exists under natural pressure. Such waters are primarily found in artesian systems, where they are situated between two impermeable rock layers. Their ability to flow spontaneously from wells distinguishes them from groundwater, which requires pumping for extraction. Due to the isolation provided by the impermeable layer, artesian water from the Oligocene is less susceptible to contamination. In Poland, the largest deposits of this type of water are located in the Mazowiecka and Łódzka basins. The name of this water is associated with the medium- to coarse-grained glauconitic sands characteristic of the Oligocene.

As previously noted, the composition of oligo-ocean water may not always be regularly tested by sanitary authorities, meaning it may not necessarily be a healthier alternative to tap water. Additionally, it is challenging to determine its exact mineral composition and microbiological safety. Therefore, only sources that have been tested should be used. As mentioned, the composition of oligo-ocean water can vary depending on its origin. Most commonly, it is slightly alkaline water with a pH range of 6.5 to 8.1, characterized by low to moderate hardness, lack of odor, and clarity. In terms of mineralization, oligo-ocean water resembles low-mineralized water, with mineral content ranging from 300 to 600 mg/l. It primarily consists of bicarbonates, chlorides, calcium, magnesium, potassium, and sodium. Iron is also frequently found in groundwater, present as divalent ferrous ions, which facilitates its absorption by the body. However, it is always advisable to check the water's composition before consumption, as it may contain elevated levels of certain substances that are not recommended for children or individuals with specific health conditions.

Oligocene groundwater, distinguished by its excellent quality, differs from treated water, particularly surface water, due to the following health-relevant characteristics: a natural, mineral-rich chemical composition containing both macro- and micro-elements; a natural balance between water components that benefits physiological processes in living cells; the absence of foreign substances used in the treatment process; the lack of by-products from reactions between disinfectants and the water's natural components. Comparative studies between Oligocene water and tap water revealed that Oligocene well water contains, on average, more magnesium, twice as much potassium, and nearly three times as much sodium as tap water. Conversely, it contains less calcium and zinc than untreated tap water. The high sodium content in Oligocene water may be nutritionally unfavorable, especially for individuals who need to limit sodium intake for health reasons. This water can be stored at room temperature for a maximum of 24 hours and in the refrigerator for up to 48 hours. Its short shelf life is partly due to microbial growth, necessitating frequent and thorough cleaning of water containers. The best practice is to transfer the water directly from the source into glass bottles or canisters. Additionally, heating the water can extend its shelf life. Purchasing bottled water ensures it is free from bacterial and chemical contaminants, and it also has a longer shelf life. Therefore, during summer, it is advisable to consume mineral or spring water.

Oligocene water is sold both online and in select grocery stores, with each litre costing more than 6 PLN. Residents near oligocene sources can collect the water directly from the spring using glass bottles. This water serves as an alternative to mineral, spring, or tap water. Those living near such sources should particularly take advantage of this water, but it must be stored properly, as it deteriorates quickly in plastic bottles, develops an unpleasant odour, and alters its taste.