Pool, Spa & Water Treatment Chemistry worked example

Stock Solution Strength at 5.75% target stock strength: a worked example

Push target stock strength up to 5.75% and the picture changes. This example computes every intermediate figure at that operating point. Use it to document batch strength for chemical feed, cleaning, or water-treatment stock tanks.

The inputs for this scenario

  • Active ingredient amount: 10 lb (unchanged)
  • Total solution mass: 417 lb (unchanged)
  • Target stock strength: 5.75 % (raised for this scenario; the documented default is 5)

Working through the calculation

  • Applying the documented formula (Stock solution strength = active ingredient / total solution mass x 100) to the inputs above produces each figure below.
  • At this operating point the engine returns 2.4 % for stock solution strength, the number this scenario is built around.
  • At this operating point the engine returns 3.35 points for difference from target.
  • At this operating point the engine returns 10 count for active ingredient.
  • At this operating point the engine returns 417 count for solution mass.

How this compares with the baseline

  • Against the tool's baseline example, where target stock strength sits at 5% and the headline result is 2.4 %, this scenario lands almost exactly on the baseline at 2.4 %.
  • It computes the actual percent-by-weight strength of a mixed solution and the point difference from a target strength. 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

  • Stock solution strength: 2.4 % (headline result)
  • Difference from target: 3.35 points
  • Active ingredient: 10 count
  • Solution mass: 417 count

Run it with your numbers

  • Every input above is editable in the live Stock Solution Strength calculator, which recalculates instantly and can be shared with the inputs intact.

Last reviewed 2026-05-12.