Pool volume calculator

Your pool

Each reading against its band

• Free chlorine 0.5ppm ▲outside the code band
  code band 1.0–10.0 ppm; ideal 2.0–4.0 ppm · +2.5 What free chlorine takes
• pH 8.0pH ▲outside the code band
  code band 7.2–7.8 pH; ideal 7.4–7.6 pH · −0.5 Fix pH
• Total alkalinity 60ppm ●inside the code, off ideal
  code band 60–180 ppm; ideal 80–120 ppm · +40 What total alkalinity takes
• Calcium hardness 180ppm ●inside the code, off ideal
  code band 150–400 ppm; ideal 200–400 ppm · +120 What calcium hardness takes
• Stabilizer 20ppm ●inside the code, off ideal
  code band up to 100 ppm; ideal 30–50 ppm · +20 What stabilizer takes

What to add

Order matters. Add one thing at a time, and let the pump turn the water over before the next. The only published wait we have found is for acid: test again 30 minutes after each dose. For anything else we put no number on it.

Fix a reading

• Raise salt
• How to lower pH
• Total alkalinity, and how to raise it
• How to raise pH
• Free chlorine, and how to raise it
• Shock the pool, and how much to add
• How to lower total alkalinity
• Stabilizer, and how to raise it
• Calcium hardness, and how to raise it

In litres and metres

Standard pool sizes

• 13,000 gal How many gallons a 24 ft round pool holds
• 7,300 gal How many gallons an 18 ft round pool holds
• 16,400 gal 27 ft round pool, in gallons
• 21,100 gal 16 × 32 ft
• 5,070 gal 15 ft round
• 26,700 gal 18 × 36 ft pool, in gallons