The Four Pillars and Their Couplings
One mechanism from Chapter 11: The Pillars of Water Treatment.
graph LR Corrosion["Corrosion (the Thief)"] Scale["Scale (the Insulator)"] Biology["Microbiological Growth (the Living Threat)"] Solids["Suspended Solids (the Amplifier)"] Scale -->|"O2 differentials, thermal stress"| Corrosion Corrosion -->|"iron oxide nucleation sites"| Scale Biology -->|"anaerobic zones, SRB, MIC"| Corrosion Corrosion -->|"tubercles shelter and nutrients"| Biology Biology -->|"insulation, EPS traps ions"| Scale Scale -->|"rigid protective shelter"| Biology Solids -->|"amplifies all three"| Corrosion Solids -->|"amplifies all three"| Scale Solids -->|"amplifies all three"| Biology