Pool, Spa & Water Treatment Chemistry worked example

Acid Demand Alkalinity Correction with current total alkalinity of 350 ppm: a worked example

Push current total alkalinity up to 350 ppm and the picture changes. This example computes every intermediate figure at that operating point. Use it when lowering alkalinity while managing pH rebound in pools or spas.

The inputs for this scenario

  • Current total alkalinity: 350 ppm (raised for this scenario; the documented default is 140)
  • Target total alkalinity: 90 ppm (unchanged)
  • Reduction from planned acid dose: 35 ppm (unchanged)
  • Reduction from second scheduled dose: 0 ppm (unchanged)

Working through the calculation

  • Applying the documented formula (Remaining correction = current alkalinity - target alkalinity - planned reduction - additional scheduled correction) to the inputs above produces each figure below.
  • At this operating point the engine returns 225 ppm for remaining alkalinity correction, the number this scenario is built around.
  • At this operating point the engine returns 125 value for target plus planned reductions.
  • At this operating point the engine returns 350 value for current alkalinity.
  • At this operating point the engine returns 64.29 % for utilization.

How this compares with the baseline

  • Against the tool's baseline example, where current total alkalinity sits at 140 ppm and the headline result is 15 ppm, this scenario comes in 1,400% above the baseline at 225 ppm.
  • It computes the ppm of total alkalinity still to be corrected after subtracting the target level and any planned acid-dose reductions. The value of this scenario is the size of the gap it exposes: that gap, priced out over a year, is the budget you can justify spending to close it.

Results at a glance

  • Remaining alkalinity correction: 225 ppm (headline result)
  • Target plus planned reductions: 125 value
  • Current alkalinity: 350 value
  • Utilization: 64.29 %

Run it with your numbers

  • Every input above is editable in the live Acid Demand Alkalinity Correction calculator, which recalculates instantly and can be shared with the inputs intact.

Last reviewed 2026-05-12.