Pool Water Chemistry

What Is Saturation Index?

A pool saturation index estimates whether water tends to deposit or dissolve calcium carbonate under specified conditions.

Qualitative saturation-index axis with zero at equilibrium, negative toward calcium carbonate dissolution and positive toward deposition. Not a safe-water or general corrosion scale.

Understanding the Concept

The calculation combines measurements such as pH, calcium hardness, alkalinity, temperature and dissolved solids. It is a model of calcium carbonate balance.

Common Misunderstanding

An index value is not a disinfectant reading or a guarantee against every form of corrosion. Different formulas and adjustments require consistent inputs.

Related terms

Calcium Hardness
Pool pH
Total Alkalinity

Learn more

Total Alkalinity Explained: Why It’s Your Pool Chemistry’s Shock Absorber

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