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In general, faster flowing water dissolves less material. The eventual quality of the groundwater depends on temperature and pressure conditions, on the kinds of rock and soil formations through which the groundwater flows, and possibly on the residence time. In its passage from recharge to discharge area, groundwater may dissolve substances it encounters or it may deposit some of its constituents along the way. Soils contain high concentrations of carbon dioxide which dissolves in the groundwater, creating a weak acid capable of dissolving many silicate minerals. One of the most important natural changes in groundwater chemistry occurs in the soil. Near coastlines, precipitation contains higher concentrations of sodium chloride, and downwind of industrial areas, airborne sulphur and nitrogen compounds make precipitation acidic. The kinds of chemical constituents found in groundwater depend, in part, on the chemistry of the precipitation and recharge water.
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The chemical nature of water continually evolves as it moves through the hydrologic cycle. But why is this? It's because your water is changing as it moves about the planet. Both groundwater and surface water may contain many constituents, including microorganisms, gases, inorganic and organic materials. Water is never found in a pure state in nature. In this day and age, what products could be be pure? Water is no different in this regard. Purity is a word that is not very commonly used with confidence and certainity. Search IS IT COMMON TO FIND PURE WATER IN NATURE?