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Conductivity gives a rough idea of the amount of dissolved ions in water (mS/m) or (µS/cm). Distilled water is <1 µS/cm, Reverse Osmosis treated 1-10 µS/cm, water from some sorts of sandstone or from granite (soft water) 5-15 µS/cm, and water from limestone (hard water) 20-200 µS/cm. Thus, the variation of the contribution of minerals from drinking water is large. A Swedish study on well waters, b
