Pool volume calculator

Your pool

Your readings

• Free chlorine 0.5ppm ▲outside the code band
  ideal 2.0–4.0 ppm · +2.5 What Free chlorine takes
• pH 8.0pH ▲outside the code band
  ideal 7.4–7.6 pH · −0.5 Fix pH
• Total alkalinity 60ppm ●inside the code, off ideal
  ideal 80–120 ppm · +40 What Total alkalinity takes
• Calcium hardness 180ppm ●inside the code, off ideal
  ideal 200–400 ppm · +120 What Calcium hardness takes
• Stabiliser 20ppm ●inside the code, off ideal
  ideal 30–50 ppm · +20 What Stabiliser takes

What to add

Order matters. Alkalinity buffers pH, so set the alkalinity first — the pH you correct before it will move again when the alkalinity does. Add one thing at a time, let the pump turn the water over, and test again before you add the next. No product page we have read states how long to wait, so we do not put a number on it.

Fix a reading

• raise Raise salt
• lower How to lower pH
• raise Total alkalinity, and how to raise it
• raise How to raise pH
• raise Free chlorine, and how to raise it
• shock Free chlorine, and how to shock it
• lower How to lower Total alkalinity
• raise Stabiliser, and how to raise it
• raise Calcium hardness, and how to raise it

In litres and metres

What people ask