Pool, Spa & Water Treatment Chemistry worked example
Chemical Feed Pump Setting with required treatment dose of 5 mg / L: a worked example
What does the result look like when required treatment dose reaches 5 mg / L? The full calculation is worked below with real intermediate numbers. Use it to set metering pumps for sanitizer, acid, caustic, coagulant, or specialty treatment feeds.
The inputs for this scenario
- Required treatment dose: 5 mg / L (raised for this scenario; the documented default is 2)
- Feed solution concentration: 100 mg / mL (unchanged)
- Treated water flow: 227 L / min (unchanged)
Working through the calculation
- Applying the documented formula (Feed pump setting = required dose / feed solution concentration x treated water flow in L/min) to the inputs above produces each figure below.
- At this operating point the engine returns 11.35 mL / min for ratio, the number this scenario is built around.
- At this operating point the engine returns 0.05 value for raw ratio.
- At this operating point the engine returns 227 x for flow rate (l/min).
- At this operating point the engine returns 100 value for stock concentration (mg/ml).
How this compares with the baseline
- Against the tool's baseline example, where required treatment dose sits at 2 mg / L and the headline result is 4.54 mL / min, this scenario comes in 150% above the baseline at 11.35 mL / min.
- A figure at this level is achievable when required treatment dose is genuinely sustained, not just peaked for a shift. It assumes a steady water flow and a stable feed solution strength; degraded chlorine or a fluctuating flow will drift the actual dose, so confirm with a residual test.
Results at a glance
- Ratio: 11.35 mL / min (headline result)
- Raw ratio: 0.05 value
- Flow rate (L/min): 227 x
- Stock concentration (mg/mL): 100 value
Run it with your numbers
- Every input above is editable in the live Chemical Feed Pump Setting calculator, which recalculates instantly and can be shared with the inputs intact.
Last reviewed 2026-05-12.