Corrosion ControlAdvanced 20 min read

Corrosion Control: System Optimization

Compares LSI, Ryznar Stability Index, Aggressiveness Index, and CCPP; introduces Optimal Corrosion Control Treatment (OCCT); weighs phosphate vs. pH/alkalinity strategies; and covers galvanic, uniform, and pitting corrosion mechanisms alongside softening and chloramine interactions.

By the time you're operating at the Class B level, corrosion control stops being a single number to check and becomes a system to optimize — balancing multiple stability indices, weighing phosphate against pH/alkalinity treatment philosophies, and understanding how changes elsewhere in your treatment train ripple into corrosivity at the tap. This guide compares the major saturation indices operators and engineers actually use, introduces the regulatory concept of Optimal Corrosion Control Treatment (OCCT), works through the tradeoffs between the two dominant treatment strategies, and examines how corrosion mechanisms differ and interact with softening and disinfection choices elsewhere in your plant.

Comparing the Corrosion and Scaling Indices

Langelier Saturation Index (LSI) — Recap and Limitations

As covered at the Class C level,

LSI = pH - pH_s

, where

pH_s

is the theoret

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