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.
Limescale is a hard, chalky deposit, consisting mainly of calcium carbonate. It often builds up inside kettles, boilers, and pipework, especially those used for hot water since pipes containing hot wa
Hard water
…health benefits due to the mineral content. It can pose critical problems in industrial settings, where water hardness is monitored to avoid problematic limescaling in boilers, cooling towers, and other equipment that handles water. In domestic settings, hard water is often indicated by a lack of foam formation…
Limescale build-up inside a pipe reduces both liquid flow through the pipe and thermal conduction from the liquid to the outer pipe shell. Both effects will reduce the pipe's overall thermal efficiency in a heat exchanger.
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.
Several large pieces of limescale removed from an electric kettle.
A scanning electron micrograph of limescale (The field of view is 64 × 90 μm).