Test the water first
Without a reliable test, it is easy to add too much product without fixing the underlying problem.
Calculators
Water chemistry
Pool chemical dosing calculator
Enter pool volume, current and target readings, and product concentration. The calculator estimates a product quantity, which you must check against the label.
Calculator
Estimate a chlorine adjustment
Enter pool volume, current free chlorine, your target and the available-chlorine percentage on the product label. The values shown are a calculation example, not recommended water conditions. Choose the target for your pool, taking cyanuric acid and the product instructions into account. The result estimates product mass; it does not confirm that the water is safe for swimming.
Before treatment
What to check before adding chemicals
Check pH before adjusting chlorine
If pH is outside the appropriate range, chlorine may not perform as expected.
Use the actual water volume
The same product quantity cannot be suitable for both a small and a large pool.
Read the product label
Concentrations differ between products. The label’s instructions take priority over a general calculation.
Before dosing
A quick checklist
The estimate depends on accurate readings, water volume and product concentration. Check each before dosing.
- 1measure pH and free chlorine
- 2check pool volume in m³
- 3read the active-ingredient concentration on the label
- 4never mix different chemicals together
- 5add the product with circulation running if its instructions require it
- 6retest after the waiting time on the label
Next steps
What to check after calculating a dose
FAQ
Chemical dosing questions answered
Does the calculator replace the manufacturer’s instructions?
No. It estimates a dose using volume and available-chlorine percentage. Always follow the product label and instructions.
Why enter the available-chlorine percentage?
Products have different concentrations. A different available-chlorine percentage means a different product mass is needed for the same change in free chlorine.
What if pH is high?
Correct pH according to the product instructions. Retest, then decide whether the disinfectant level also needs adjustment.
Should I shock the pool straight away?
Not necessarily. Shock treatment is appropriate for particular problems. Start with testing, pH, water volume, the product label and filtration.