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2. Water softening - Wikipedia

   en.wikipedia.org/wiki/Water_softening

   The waste waters eluted from the ion-exchange column containing the unwanted calcium and magnesium salts are typically discharged to the sewage system. [3] Recharge typically takes the following steps: [11] Backwash: Water is directed through the resin in the direction opposite to that of normal flow, and the output is sent to a drain for disposal.

3. Lime softening - Wikipedia

   en.wikipedia.org/wiki/Lime_softening

   Lime softening produces large volumes of a mixture of calcium carbonate and magnesium hydroxide in a very finely divided white precipitate which may also contain some organic matter flocculated out of the raw water. Processing or disposal of this sludge material may be an additional cost to the process. Drying and re-calcining the waste allows ...

4. How to remove hard water deposits from your faucets and shower

   www.aol.com/remove-hard-water-deposits-faucets...

   Calcium and magnesium are the main culprits when it comes to creating hard water. And in the U.S., it's almost impossible to avoid it, as hard water is present across 85 percent of the country ...

5. Calcium Lime Rust - Wikipedia

   en.wikipedia.org/wiki/Calcium_Lime_Rust

   Calcium deposits, primarily composed of calcium carbonate (CaCO 3), react with weak acids to form calcium salts that are soluble in water. The general reaction can be represented as follows: CaCO 3 + 2H + → Ca 2+ + CO 2 + H 2 O. Here, H + represents the hydrogen ions provided by the acid

6. How to clean grout in floor tiles - AOL

   www.aol.com/news/clean-grout-floor-tiles...

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7. Limescale - Wikipedia

   en.wikipedia.org/wiki/Limescale

   Descaling agents are commonly used to remove limescale. Prevention of fouling by scale build-up relies on the technologies of water softening or other water treatment. This column in the Bad Münstereifel church in Germany is made from the calcium carbonate deposits that built up in the Roman Eifel Aqueduct over several centuries of use.

8. Concrete degradation - Wikipedia

   en.wikipedia.org/wiki/Concrete_degradation

   If the physico-chemical conditions prevailing in the seeping water evolve with distance along the water path and water becomes supersaturated with respect to certain minerals, they can further precipitate, making calthemite deposits (predominately calcium carbonate) inside the cracks, or at the concrete outer surface.

9. Fouling - Wikipedia

   en.wikipedia.org/wiki/Fouling

   An example of the temperature dependence of solubility is shown in the figure. Calcium sulfate is a common precipitation foulant of heating surfaces due to its retrograde solubility. Precipitation fouling can also occur in the absence of heating or vaporization. For example, calcium sulfate decreases its solubility with decreasing pressure.