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Field Notes

The chemistry, written down.

Cited articles on pool water chemistry. Every Field Note is checked against its published sources and carries a last reviewed date.

Chemistry deep diveJul 21, 2026 · 9 min read

Do Pool Phosphates Matter? Why Both Sides of the Debate Are Half Right

Chlorine releases phosphate from algae cells in every correctly sanitized pool. Why phosphate does not cause algae on its own, and when it matters.

Moving to the new siteJul 5, 2026

The Cyanuric Acid to Free Chlorine Equilibrium

This Field Note is being moved over from the current site and checked against its sources.

Moving to the new siteOct 6, 2026

Pool Plaster Mottling: Causes, Chemistry, and the Real Fix

This Field Note is being moved over from the current site and checked against its sources.

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