What does Calcium Hardness (CH) measure in pool water?

Calcium Hardness (CH) measures the concentration of calcium ions in pool water. This is an essential parameter because an appropriate level of calcium hardness helps maintain water quality, protect pool surfaces, and prevent corrosion of metal components. When calcium levels are too low, it can lead to aggressive water conditions that may cause etching on plaster surfaces and corrosion of pool equipment. Conversely, excessively high levels can cause scaling on surfaces and in the pool plumbing. Maintaining balanced calcium hardness is crucial for the health of both the pool system and those using the pool. This understanding is fundamental for pool operators when managing water chemistry.