Chemical dosing and dosing pump calculators
Dose rates, chemical compatibility, pH / alkalinity and LSI scaling risk at a glance. Built for operators and dosing technicians.
Method & worked example
Convert a specified dose to dosing-pump flow
Keep the water flow, active chemical dose and stock concentration on the same basis. The target below is an arithmetic assumption, not a treatment recommendation.
| Input or step | Value or calculation |
|---|---|
| Water flow | 20 m³/h = 20,000 L/h |
| Specified active dose | 2 mg/L |
| Active chemical required | 20,000 × 2 = 40,000 mg/h = 40 g/h |
| Stock concentration, same active basis | 10 g/L |
| Stock solution flow | 40 g/h ÷ 10 g/L = 4 L/h |
What can change the required pump size?
Check minimum and peak water flows, stock strength, discharge pressure, pump turndown and the supplier's calibration data. A nominal pump capacity does not confirm that the required flow will be delivered against the injection pressure.
A concentration in percent by mass needs the solution density before it can be expressed in g/L. Confirm whether the supplier's strength is stated as the active component or the supplied compound. Do not interchange these bases.
Choose the calculation
CHM-002 feed-rate pump sizing connects dose to consumption and pump flow; CHM-005 dosing pump rate uses a stock concentration. For water-quality interpretation, start with the laboratory report guide.
LSI describes calcium-carbonate saturation under the stated water conditions; it does not establish overall corrosion risk. Compatibility and mixing screens also require current supplier information, safety data sheets and a competent assessment. This example does not specify a mixing procedure or an acceptable treatment dose.
Static educational example · Updated 1 October 2026 · Methods and limitations. Project calculations run in the subscription application; New accounts require approval.
Why it matters on the job
Check calcium-carbonate saturation
Use LSI as a saturation indicator alongside the full water analysis and material conditions.
Doses that land
Acid, chlorine and coagulant rates worked to flow and target.
Compatibility screening
Screen combinations and materials, then confirm against current supplier guidance and safety data sheets.
12 Chemicals, Dosing & Chemistry calculators
Every calculator in this category, by its reference code. Running them requires an approved Tenselo account with access to the relevant calculators.
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CHM-001 Acid Dilution
C1*V1 = C2*V2 with safety factor
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CHM-002 Chemical Dosing & Feed Rate Pump Sizing
Dose -> kg/day, L/day, pump mL/min & drum run-time
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CHM-003 Chlorine Shock Dose
Liquid chlorine volume for a target ppm (AU w/v strengths)
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CHM-004 Disinfection CT
Contact-time dose product (free chlorine basis)
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CHM-005 Dosing Pump Rate
Inject target mg/L from a stock g/L
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CHM-006 pH / Alkalinity Adjustment Dose
Acid or alkali dose to shift alkalinity by a target amount (stoichiometric, mg/L & kg/day)
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CHM-007 Corrosion & Scaling Indices
LSI / Ryznar / Puckorius / Larson-Skold from one analysis
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CHM-008 EC / TDS Conversion
Electrical conductivity to total dissolved solids
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CHM-009 Hardness / Free CO2
Convert mg/L CaCO3 to grains, estimate free CO2
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CHM-010 LSI (Langelier)
Scaling vs corrosion balance
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CHM-011 Chemical Compatibility
Chemical + strength + temperature -> pipe, fitting, sealant & seal materials
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CHM-012 Chemical Mixing / Reaction Hazard
Pick two chemicals - the likely reaction (toxic gas, fire, heat, gel), the product + formula and a plain-English warning (NOAA/CCPS reactive groups)
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