Depth water (hyplominion)
The hyplominion is a water layer located deeply beneath the Earth's surface. It forms over a period of many decades and consists of rainwater that is cleaned and filtered during the long process of seeping through the various layers of earth and rock. On its way through the soil the water assimilates carbonic acid and minerals. Depth water is a pure product of nature – and it is usually the source of mineral water.
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Mineral water formation