Pool Chemical Calculator - Exact Dosages
Enter your pool volume and water test results to see how much liquid chlorine, acid, bicarb, or calcium chloride to add — in grams, kilograms, or millilitres.
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Understanding your pool water chemistry
Balanced pool water protects swimmers and equipment. Water that is too acidic corrodes pumps, heaters, and pool surfaces. Water that is too alkaline causes scale buildup and reduces chlorine effectiveness.
In Australian conditions, pools typically need more frequent testing during summer due to high UV levels, evaporation, and heavy bather loads. During winter, weekly testing is generally sufficient for most residential pools.
The most important rule: adjust one chemical at a time, allow the water to circulate, then re-test before making another change. pH and alkalinity are interrelated — raising alkalinity will slightly raise pH, and lowering pH with acid will also lower alkalinity.
Ideal water chemistry ranges
- Free chlorine — 2–4 ppm for residential pools
- pH — 7.2–7.6
- Total alkalinity — 80–120 ppm
- Calcium hardness — 200–400 ppm
When to call a professional
If your water stays cloudy after dosing, you detect a strong chlorine smell despite low free chlorine readings, or you are unsure about product concentrations, a qualified pool technician can test on-site and recommend a treatment plan.
Good to know
Frequently asked questions
What are ideal pool chemical levels in Australia?
Typical targets are free chlorine 2–4 ppm, pH 7.2–7.6, total alkalinity 80–120 ppm, and calcium hardness 200–400 ppm. Always confirm against your test kit instructions.
Can I add multiple chemicals at once?
Adjust one parameter at a time, allow the water to circulate, then re-test before making another change. pH and alkalinity interact, so changing both together can overshoot.
Are these doses exact for every product?
These estimates assume common Australian concentrations: 12.5% liquid chlorine and 32% hydrochloric acid. Always read the label on the product you are using.