Understanding Pool Chemistry: The Complete Guide

Proper pool chemistry is essential for clean, safe water. This guide explains the three most important chemical levels you need to monitor: pH, chlorine, and total alkalinity.

pH Levels: The Foundation

pH measures how acidic or basic your pool water is. The ideal range is 7.2 to 7.6.

• Low pH (below 7.2): Corrosive water, eye irritation, equipment damage
• High pH (above 7.6): Cloudy water, chlorine inefficiency, scale formation
• Ideal pH (7.2-7.6): Comfortable swimming, effective sanitization

Chlorine: The Sanitizer

Chlorine kills bacteria and algae. Maintain 1-3 ppm (parts per million) for optimal sanitization.

• Free Chlorine: Available to sanitize (target: 1-3 ppm)
• Combined Chlorine: Used up chloramines (should be < 0.5 ppm)
• Total Chlorine: Free + Combined

Total Alkalinity: The Buffer

Alkalinity stabilizes pH and prevents rapid fluctuations. Ideal range: 80-120 ppm.

• Low alkalinity: pH bounces, corrosion risk
• High alkalinity: pH hard to adjust, cloudy water

Testing Schedule

• Daily: Chlorine and pH (during heavy use)
• Weekly: Full chemical panel
• Monthly: Calcium hardness, cyanuric acid, metals