Staining occurs because water has a natural demand for minerals. It attempts to satisfy this demand by garnishing minerals from other available sources such as heating elements, plumbing, etc. This corrosion is not only damaging to your equipment, but it also can stain your water and shell surface. All soft water should also be tested for hardness levels. An ideal level is between 100 - 200 ppm.
Water hardness describes the total amount of calcium present in the water.
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