Hard water stream

Legend for map: Changes in salinity of U. I remember when my parents bought a water softener after a family move. We had never had one before and I wondered why we needed a large contraption to treat the water coming into the house. Water softeners also help reduce excessive scale build-up in pipes, preserving plumbing. Extremely soft water is almost like distilled water with low concentrations of dissolved chemicals. You might find such water in a high mountain lake or stream.
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Hard Water Vs. Soft Water – What’s The Difference?

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The Hard and Soft of Freshwater – Global Water Blog

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Hardness of Water

Water rich in these cations is said to be "hard. Sometimes it also provides a measure of the influence of human activity in the area. For instance, acid mine drainage often results in the release of iron into a stream.
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The main difference lies in the level of minerals they contain. Hard water contains a large amount of minerals, while soft water contains very little. This distinction is mainly due to the geological nature of the soil or the geographical area where the water comes from. Soft water contains minute amounts of salt. This water comes mainly from rivers, lakes, streams and marshes that have not been exposed for long periods to mineralized rock formations.
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