Corrosion Control Calculator
Calculate the Langelier Saturation Index (LSI) and Ryznar Stability Index for pipe corrosion prevention in drinking water.
Inputs
mg/L as CaCO₃
mg/L as CaCO₃
mg/L
°C
Results
Langelier Saturation Index
-1.01
LSI Interpretation
Highly Corrosive (aggressive water)
Ryznar Stability Index9.22
RSI InterpretationVery Corrosive
Aggressive Index11.1
AI InterpretationModerately Aggressive
Saturation pH (pHs)8.21
Target pH for Balance8.21
Recommended TreatmentpH adjustment (lime/caustic soda) + corrosion inhibitor
Lead/Copper Rule RiskModerate Risk
CaCO₃ Precipitation Potential-25 mg/L
How to Use This Calculator
- Enter Water pH from your latest distribution system or treatment plant measurement.
- Input Total Alkalinity (mg/L as CaCO₃) and Calcium Hardness (mg/L as CaCO₃) from a water quality analysis.
- Enter Total Dissolved Solids (mg/L) and Water Temperature (°C) to complete the water chemistry profile.
- Review the Langelier Saturation Index (LSI): negative values indicate corrosive water, positive values indicate scaling tendency.
- Check the Ryznar Stability Index (RSI) and Aggressive Index (AI) for additional corrosion characterization.
- Use the interpretation outputs to guide pH, alkalinity, or inhibitor adjustments to meet Lead and Copper Rule corrosion control requirements.
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