Calcium Saturation Index

Since the early 1960s, the pool industry has been using a concept called the Calcium Saturation Index (CSI) to predict water’s tendency to be corrosive or scale-forming. And for just as long, it has been both a friend and a nemesis. The index is fraught with errors in its understanding, causing some aquatic professionals to question its application to pools. With a better understanding of the common myths and mistakes associated with the CSI, pool operators will be able to …


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