Pool chemical calculator
Enter the pool volume in litres, the current reading, and the target. The result is a published dosing guide for pH up, pH down, total alkalinity, stabiliser, or chlorine shock. Where sources disagree, the result is a range. The inputs stay in the URL so the result can be shared.
Formulas
These figures are published guides. Strengths differ between products; use the dose on the pack you have. pH dose also depends on total alkalinity. The sources treat the figures as a guide; add a portion, retest, then add more if needed.
- pH up
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- 150 g soda ash per 10,000 L per 0.2 pH. Source: Viva Blu soda ash.
- pH down
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- 60 g dry acid per 10,000 L per 0.1 pH. Source: Mr Pool Man chemical guide.
- 25 ml hydrochloric acid per 10,000 L per 0.1 pH. Source: Mr Pool Man chemical guide.
- 0.720 L hydrochloric acid 32% per 40,000 L per 1.0 pH (8.0 to 7.0). Source: Pool Clear treatment table.
- Total alkalinity
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- 0.671 kg sodium bicarbonate per 40,000 L per 10 ppm. Source: Pool Clear treatment table.
- 180 g sodium bicarbonate per 10,000 L per 10 ppm. Source: Mr Pool Man chemical guide.
- 200 g sodium bicarbonate per 10,000 L per 10 ppm. Source: Mr Pool Man ultimate guide.
- Stabiliser
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- 100 g cyanuric acid per 10,000 L per 10 ppm. Source: Mr Pool Man chemical guide.
- Chlorine shock
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- 15 g unstabilised chlorine per 10,000 L per 1 ppm. Source: Mr Pool Man ultimate guide.
- 4.0 L liquid chlorine 12.5% per 50,000 L per 10 ppm. Source: My Fibreglass Pool Easy shock guide.
- 0.333 L liquid chlorine 12% per 40,000 L per 1 ppm. Source: Pool Clear treatment table.
Stabiliser at 100 g of cyanuric acid per 10,000 L per 10 ppm is also the figure on the Mr Pool Man blog and on the Pool Clear table (0.400 kg per 40,000 L per 10 ppm).
The APVMA home-pool label format lists super chlorination at 10 mg/L free chlorine. NSW Health describes shock superchlorination as raising free chlorine to ten times the combined chlorine reading. Enter the target from those rules or from the product label; this page does not set a default. Pool Advisor works the available-chlorine mass as 1 ppm = 1 mg/L, so a 50,000 L pool with 2 ppm combined chlorine needs 1.0 kg of available chlorine to add 20 ppm (see the Pool Advisor shock calculator and the NSW Health chloramine factsheet ). The APVMA label format is in F2014L00838 .
The volume calculator can fill litres here from its current result.