Plan dosing for coagulants, disinfectants, and conditioners confidence. See mass, solution volume, and pump settings. Download results, verify assumptions, and document your work clearly.
| Scenario | Flow | Dose | Strength | Density | Runtime | Approx. Pump Setting |
|---|---|---|---|---|---|---|
| Coagulant feed | 500 m³/day | 25 mg/L | 12.5% w/w | 1.20 kg/L | 24 h/day | ~ 578.7 mL/min |
| Disinfectant feed | 120 m³/hour | 2 mg/L | 10% w/w | 1.10 kg/L | 16 h/day | ~ 181.8 mL/min |
| pH conditioning | 35 L/s | 15 mg/L | 150 g/L | 1.15 kg/L | 12 h/day | ~ 274.0 mL/min |
Pretreatment chemicals such as coagulants, oxidants, and pH conditioners stabilize upstream water quality so downstream units run consistently. Under-dosing can reduce turbidity and organic removal, while over-dosing can raise sludge volumes, increase corrosion risk, and inflate operating cost. This calculator converts a dose target into daily mass, solution volume, and practical pump settings, helping teams document assumptions and repeat setups across shifts.
Flow and dose drive active demand: liters per day multiplied by mg/L sets the daily active mass. Strength and density convert that active requirement into solution liters per day, which is what dosing pumps deliver. Use current product data sheets and confirm density at site temperature. If strength is provided as g/L active, the tool converts it to a mass fraction using density.
Many plants do not dose for 24 hours. When runtime is reduced, the required feed rate rises, and the calculator outputs both L/h and mL/min to match common pump panels. For commissioning, compare calculated mL/min with a timed drawdown test to confirm actual pump calibration. Apply a safety factor when influent quality swings or when control feedback is limited.
Some sites prepare a stock solution in a day tank to improve pumpability or reduce handling. The optional dilution section estimates how many liters of delivered chemical solution must be added to reach a target stock mg/L in a known tank volume. Always add chemical to water as specified by the manufacturer, provide mixing, and keep secondary containment available.
After setting the feed rate, verify process response with simple field indicators: pH, oxidation-reduction potential, turbidity, and jar testing trends. Track daily solution usage against the calculator’s L/day output; large gaps often indicate mis-set runtime, incorrect strength entry, or pump drift. Exporting a CSV or PDF report supports shift handover and audit-ready records.
For dilute aqueous systems, ppm is commonly treated as mg/L. If your liquid is not water-like or has high solids, confirm the appropriate conversion before relying on ppm equivalence.
Pumps deliver volume, but strength is a mass fraction. Density converts solution mass to solution volume, so the same active kg/day can require more or fewer liters depending on product density.
Many operators start with 1.05 to 1.20 when influent quality varies. Use the smallest factor that still maintains performance, and refine it after trending jar tests and process feedback.
Set runtime to the hours the dosing pump actually runs each day. If dosing is interlocked with flow or shift schedules, use that net time, not 24, to avoid underfeeding.
Yes. Select g/L active and provide density. The tool converts g/L into a mass fraction using density, then computes solution liters per day and pump settings from that fraction.
It estimates how much delivered chemical solution to add to a tank to achieve a target stock mg/L as active. It does not replace manufacturer mixing instructions or safety requirements.
Differences usually come from flow changes, incorrect strength entry, pump calibration drift, or intermittent runtime. Compare a measured daily drawdown against the calculated L/day and adjust inputs to match reality.
Important Note: All the Calculators listed in this site are for educational purpose only and we do not guarentee the accuracy of results. Please do consult with other sources as well.