Chemical Dosing Calculator

Calculate daily chemical consumption, stock solution requirements, and dosing pump rate for coagulants, disinfectants, and pH adjustment chemicals used in water and wastewater treatment.

Free · 8 Chemicals · Dosing Pump Sizing

Chemical Dosing Parameters

Calculate daily chemical consumption, stock solution requirement, and dosing pump rate.

Chemical

Purpose: Coagulation / primary treatment
Note: Dose varies with raw water turbidity. Jar test recommended.

Flow Rate (KLD)

Dose (mg/L)

Typical: 20–50 mg/L

Stock Strength (%)

As-prepared solution concentration

How to Use This Calculator

1Select the chemical you are dosing. Typical dose ranges are shown to guide your input.
2Enter the flow rate (KLD) of the stream being dosed and the dose in mg/L from your design or jar test.
3Enter the stock solution strength (%) you will prepare on-site. The calculator returns stock volume and pump rate.

Formulas

Chemical consumption (kg/day) = Flow (KLD) × Dose (mg/L) ÷ 1000

Stock solution (L/day) = Chemical (kg/d) ÷ (Stock% ÷ 100 × density kg/L)

Dosing pump rate (L/hr) = Stock solution (L/day) ÷ 24

Typical Dose Ranges

Chemical	Typical Dose (mg/L)	Purpose
Alum	20–50	Coagulation
PAC	10–40	Coagulation
Ferric Chloride	20–60	Coagulation / P removal
Chlorine / NaOCl	2–10	Disinfection
Lime	50–300	pH correction / P removal
Caustic Soda	50–500	pH increase

Note: Always confirm dose by jar test / pilot trial. Optimal dose varies with water quality.

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