The dosage calculator

Enter the pool volume and what you measured, and the calculator says how much of what to add.

Step by step

1. Open Pool calculator.
2. Enter the volume and the readings — chlorine, pH, alkalinity, calcium hardness, cyanuric acid, salt.
3. Read off the quantity per product.

The same calculation runs on the technician's phone during a visit — see readings and chemicals.

Good to know

The quantities come from manufacturers' figures, converted from the usual "X per 10,000 gallons raises by Y" into an amount per cubic metre per step.

Targets follow one order, and it is shown next to each field: an explicitly set target first; otherwise the middle of the range from your reading settings; otherwise our default. Without the middle step there would be two numbers for the same thing — a business that sets its pH range to 7.0–7.2 means that as its target as well.

It says where a target came from, so nobody mistakes a derived number for one they set.

Some advice is not a chemical. "Dilute" and "wait and retest" are whole sentences rather than a substance, and they are translated; substance names such as Na₂CO₃ stay the same in every language.

The calculator is public and works without a login, in all nine languages.

What it does not do

It does not know your pool. Bather load, rainfall, sunlight and what happened yesterday are not in the calculation.

It assumes the volume is right. An overstated volume overstates every dose — see dimensions and volume.