What is the legal range for Calcium Hardness in pool water?

The legal range for Calcium Hardness in pool water, which is essential for maintaining balanced water chemistry and preventing problems such as equipment corrosion or scale formation, is generally considered to be between 150 and 400 ppm (parts per million). This range ensures that there is enough calcium in the water to prevent corrosion of surfaces and equipment while also avoiding excessive hardness that can lead to cloudy water and scaling on pool surfaces.

Calcium hardness plays a crucial role in stabilizing the pool water chemistry. If the hardness is too low, it can lead to aggressive water that can corrode metal fixtures and surfaces. On the other hand, if the hardness is too high, it can cause cloudy water and scaling on pool tiles and equipment, which can negatively affect water circulation and filtration.

Thus, understanding and maintaining calcium hardness within this specified range is vital for the overall health of the pool, ensuring both the safety and comfort of swimmers.