What is a good reason why hardness in water is objectionable?

Hardness in water is often objectionable due to the scaling of boilers. When hard water is heated, the minerals—primarily calcium and magnesium—can precipitate out of solution and form scale deposits inside boilers, pipes, and other heating equipment. This scaling can lead to reduced efficiency, as it acts as an insulating barrier that can prevent effective heat transfer. In severe cases, it can cause overheating and damage to the equipment, leading to increased maintenance costs and potential breakdowns.

While hardness in water can be associated with other issues, such as household nuisances and potential impacts on equipment operation, the scaling of boilers is a specific consequence that poses significant operational and financial challenges. Recognizing this, addressing water hardness is critical in industries that rely on boilers for efficient operation.