Hard water
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Hard water is water that has a high mineral content. Hard water is formed when water percolates through deposits of limestone, chalk or gypsum, which are largely made up of calcium and magnesium carbo
A bathtub faucet with built-up calcification from hard water in Southern Arizona
A portion of the ancient Roman Eifel Aqueduct in Germany. After being in service for about 180 years, the aqueduct had mineral deposits of up to 20 cm (8 in) thick along the walls.
Water softening
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Water softening is the removal of calcium, magnesium, and a small number of other metal cations in hard water. The resulting soft water requires less soap for the same cleaning effort, as soap is not
Hard water
…foam formation when soap is agitated in water, and by the formation of limescale in kettles and water heaters. Wherever water hardness is a concern, water softening is commonly used to reduce hard water's adverse effects. Natural rainwater, snow and other forms of precipitation typically have low concentrations of…
Limescale buildup in a PVC pipe
Ion exchange resins, in the form of beads, are a functional component of domestic water softening units