What is the recommended hardness level for swimming pool water?

The recommended hardness level for swimming pool water is typically between 200 and 400 parts per million (ppm). This range is crucial for several reasons. First, calcium hardness affects the overall stability of pool water. Adequate calcium levels help prevent corrosion of pool surfaces and equipment, as well as scaling on tiles and fixtures. If hardness levels are too low, it can lead to etching of plaster or corrosion of metal fixtures, which compromises both the aesthetics and functionality of the pool.

Conversely, if the hardness level is excessively high, it can result in cloudy water and the formation of scale, which can be problematic for filtration systems and overall pool maintenance. Thus, maintaining calcium hardness within the recommended range ensures that the pool water remains balanced, protecting both the pool structure and the equipment while providing a comfortable swimming experience for users.