Pool, Spa & Water Treatment Chemistry worked example
Chemical Dilution at 1.15% target working strength: a worked example
What does the result look like when target working strength reaches 1.15%? The full calculation is worked below with real intermediate numbers. Use it when preparing diluted cleaning, treatment, or test solutions from concentrated stock.
The inputs for this scenario
- Target working strength: 1.15 % (raised for this scenario; the documented default is 1)
- Stock chemical strength: 12.5 % (unchanged)
- Final batch volume: 20 gal (unchanged)
Working through the calculation
- Applying the documented formula (Concentrate needed = target strength / stock strength x final batch volume) to the inputs above produces each figure below.
- At this operating point the engine returns 1.84 gal for ratio, the number this scenario is built around.
- At this operating point the engine returns 0.09 value for raw ratio.
- At this operating point the engine returns 20 x for efficiency factor.
- At this operating point the engine returns 12.5 value for stock strength.
How this compares with the baseline
- Against the tool's baseline example, where target working strength sits at 1% and the headline result is 1.6 gal, this scenario comes in 15% above the baseline at 1.84 gal.
- A figure at this level is achievable when target working strength is genuinely sustained, not just peaked for a shift. It assumes the stock strength on the label is accurate and current; liquid chlorine degrades and loses several percent strength per month in heat, so verify with a titration for critical dosing.
Results at a glance
- Ratio: 1.84 gal (headline result)
- Raw ratio: 0.09 value
- Efficiency factor: 20 x
- Stock strength: 12.5 value
Run it with your numbers
- Every input above is editable in the live Chemical Dilution calculator, which recalculates instantly and can be shared with the inputs intact.
Last reviewed 2026-05-12.