The pool owner’s handbook

Pool care, made clear.

Clear numbers, step-by-step fixes and honest safety advice for people who look after their own pool.

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Ideal levels at a glance

Full chart →
  • Free chlorine1–3 ppm
  • pH7.4–7.6
  • Total alkalinity80–120 ppm
  • Calcium hardness200–400 ppm (plaster)
  • Cyanuric acid30–50 ppm
  • Combined chlorineBelow 0.5 ppm
  • Ideal range
  • Acceptable range

Ranges from our Pool Chemistry Basics: The Ideal Levels Chart.

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