Calcium Phosphate Precipitation

Definition

The unwanted precipitation of calcium phosphate when a phosphate-based inhibitor program meets high pH or high calcium.

If a phosphate-based inhibitor is in use, higher pH increases the risk of calcium phosphate precipitation, fouling surfaces and reducing inhibitor effectiveness. The deposit both wastes inhibitor and creates new fouling that can shelter biology and corrosion. It is a specific failure pathway of the high-pH cascade.

Related concepts

pH Drift · Scale · Corrosion inhibitor

---

Part of The Blueprint of Water · 🧪 chemistry