Retrieving "Water Softening" from the archives

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1. Calcium

   Linked via "water softening"

   Applications
   The primary industrial use of calcium is in the form of its compounds, notably lime ($\text{CaO}$) and cement (which contains calcium silicates). These are foundational materials in the construction industry globally. Furthermore, calcium compounds are used in metallurgy as a reducing agent, in water softening processes, and in the manufac…