Pool, Spa & Water Treatment Chemistry worked example

Chemical Feed Pump Setting with required treatment dose of 1 mg / L: a worked example

Suppose required treatment dose falls to 1 mg / L. This page works the full calculation at that level so you can see exactly which result moves and by how much. Estimate chemical feed pump setting from required dose, flow, stock strength, and pump efficiency.

The inputs for this scenario

  • Required treatment dose: 1 mg / L (the input this scenario stresses; the baseline uses 2)
  • Feed solution concentration: 100 mg / mL (held at the documented default)
  • Treated water flow: 227 L / min (held at the documented default)

Working through the calculation

  • The calculation starts from the formula this tool documents: Feed pump setting = required dose / feed solution concentration x treated water flow in L/min.
  • Ratio works out to 2.27 mL / min at these inputs, and this is the headline figure for the scenario.
  • Raw ratio works out to 0.01 value at these inputs.
  • Flow rate (L/min) works out to 227 x at these inputs.
  • Stock concentration (mg/mL) works out to 100 value at these inputs.

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 50% below the baseline at 2.27 mL / min.
  • It computes the metering pump output in mL/min needed to deliver a target dose into a given treated-water flow using a feed solution of known concentration. 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

  • Ratio: 2.27 mL / min (headline result)
  • Raw ratio: 0.01 value
  • Flow rate (L/min): 227 x
  • Stock concentration (mg/mL): 100 value

Run it with your numbers

  • To rerun this with your own numbers, open the live Chemical Feed Pump Setting calculator, set required treatment dose to your actual value, and adjust the remaining inputs to match your operation.

Last reviewed 2026-05-12.