Pool, Spa & Water Treatment Chemistry worked example

Cyanuric Acid Adjustment with target cyanuric acid for sanitizer type of 20 ppm: a worked example

Suppose target cyanuric acid for sanitizer type falls to 20 ppm. This page works the full calculation at that level so you can see exactly which result moves and by how much. Calculate cyanuric acid adjustment needed from target stabilizer, current CYA, and planned treatment.

The inputs for this scenario

  • Target cyanuric acid for sanitizer type: 20 ppm (the input this scenario stresses; the baseline uses 40)
  • Current tested cyanuric acid: 25 ppm (held at the documented default)
  • Planned stabilizer change from dosing or dilution: 0 ppm (held at the documented default)
  • Extra CYA reserve above minimum: 0 ppm (held at the documented default)

Working through the calculation

  • The calculation starts from the formula this tool documents: Remaining CYA gap = target CYA - current CYA - planned correction + reserve.
  • Remaining CYA gap works out to 0 ppm at these inputs, and this is the headline figure for the scenario.
  • Current and planned CYA works out to 25 value at these inputs.
  • Target CYA works out to 20 value at these inputs.
  • Utilization works out to 0 % at these inputs.

How this compares with the baseline

  • Against the tool's baseline example, where target cyanuric acid for sanitizer type sits at 40 ppm and the headline result is 15 ppm, this scenario comes in 100% below the baseline at 0 ppm.
  • It computes the remaining cyanuric acid gap in ppm between your target and current reading after subtracting any planned stabilizer change and adding any reserve. When the numbers land here, the stressed input is the lever to work; the walkthrough above shows exactly how much each output recovers as it climbs back toward the baseline.

Results at a glance

  • Remaining CYA gap: 0 ppm (headline result)
  • Current and planned CYA: 25 value
  • Target CYA: 20 value
  • Utilization: 0 %

Run it with your numbers

  • To rerun this with your own numbers, open the live Cyanuric Acid Adjustment calculator, set target cyanuric acid for sanitizer type to your actual value, and adjust the remaining inputs to match your operation.

Last reviewed 2026-05-12.