Pool Water Chemistry
What Is Calcium Hardness?
Calcium hardness measures dissolved calcium in pool water, usually reported as parts per million as calcium carbonate.
Understanding the Concept
Calcium hardness contributes to calcium carbonate saturation. Its effect depends on pH, alkalinity, temperature and other water conditions.
Common Misunderstanding
Calcium hardness is not total hardness, which can also include magnesium. A calcium reading alone cannot predict scaling.
Related terms
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