Pool Cyanuric Acid Dose

Cyanuric acid to raise stabilizer, or -- since CYA leaves only by dilution.

Example

You enter

You get

Checked against published worked examples from: Indiana State Department of Health (adapted from the NSPF Pool & Spa Operator Handbook).

Details, formula, and sources

ScopeThe fraction and gallons of water to replace to lower it. A starting dose to add slowly and retest.

Formula or tableRaise: ~0.81 lb (~13 oz) cyanuric acid per 10,000 gal per 10 ppm; lower: drained fraction = 1 - target/current.

Source and editionNSPF CPO Handbook / ANSI-APSP-ICC (by name).

Free accessProduct labels and SDS free with the chemical; CPO course materials proprietary.

What governsMath aid for personal verification. Stop work and consult the qualified person on site if any number does not match the field condition.

API field namesgallons, current_cya_ppm, target_cya_ppm, delta_ppm, cya_lb

Details, formula, and sources

ScopeThe fraction and gallons of water to replace to lower it. A starting dose to add slowly and retest.

Formula or tableRaise: ~0.81 lb (~13 oz) cyanuric acid per 10,000 gal per 10 ppm; lower: drained fraction = 1 - target/current.

Source and editionNSPF CPO Handbook / ANSI-APSP-ICC (by name).

Free accessProduct labels and SDS free with the chemical; CPO course materials proprietary.

What governsMath aid for personal verification. Stop work and consult the qualified person on site if any number does not match the field condition.