What can excessive calcium hardness in spa water lead to?

Excessive calcium hardness in spa water can lead to scaling, which is the accumulation of calcium and other minerals on surfaces such as tiles, heater elements, and plumbing. When the water is overly saturated with calcium, it can no longer stay dissolved, which causes it to precipitate out of the water and form deposits. These scaling formations can not only detract from the appearance of the spa, making it look unclean or poorly maintained, but they can also restrict water flow, reduce heater efficiency, and potentially lead to more substantial maintenance issues if not addressed. Managing calcium levels is crucial for maintaining water balance and ensuring the longevity of spa equipment and surfaces.