Engineering tools

Water Treatment Engineering Calculators

Enter values in any calculator. Results update immediately as you type and the Calculate button opens a clear calculation popup showing the exact values and formula used.

HomeEngineering Tools

RO Recovery

Feed flow (m³/h) Permeate flow (m³/h)

Formula: Recovery = Permeate ÷ Feed × 100

Enter feed and permeate flow.

CHEMICAL

ppm Dosing

Water flow (m³/h) Dose (ppm / mg/L)

Formula: Chemical mass = Flow × Dose ÷ 1000 kg/h

Enter flow and target dose.

TANK

Rectangular Tank Volume

Length (m) Width (m) Water depth (m)

Formula: Volume = Length × Width × Depth

Enter dimensions.

COOLING TOWER

Cycles of Concentration

Make-up conductivity (µS/cm) Circulating conductivity (µS/cm)

Formula: Cycles = Circulating ÷ Make-up

Enter both conductivity values.

ETP

COD Load

Flow (m³/day) COD (mg/L)

Formula: COD load = Flow × COD ÷ 1000 kg/day

Enter flow and COD.

DISINFECTION

Chlorine Dosing

Water flow (m³/h) Target chlorine dose (mg/L) Available chlorine (%)

Formula: Product ≈ Flow × Dose ÷ (10 × Strength) L/h

Enter flow, dose and product strength.

PUMP

Hydraulic Pump Power

Flow (m³/h) Total dynamic head (m) Pump efficiency (%)

Formula: Power = ρgQH ÷ η

Enter flow, head and efficiency.

PROCESS

Tank Detention Time

Tank volume (m³) Flow (m³/h)

Formula: HRT = Volume ÷ Flow hours

Enter tank volume and flow.

FILTRATION

Filter Loading Rate

Flow (m³/h) Filter diameter (m)

Formula: Loading rate = Flow ÷ filter area

Enter flow and filter diameter.

BIOLOGICAL

ETP F/M Ratio

Flow (m³/day) Influent BOD (mg/L) MLSS (mg/L) Aeration tank volume (m³)

Formula: F/M = BOD load ÷ biomass inventory

Enter flow, BOD, MLSS and tank volume.

Engineering note: These are preliminary screening calculations, not final design tools. Confirm membrane limits, chemical concentration, pump selection, process kinetics, filter media limits, boiler/cooling chemistry and statutory requirements using current site data, laboratory analysis and OEM/design criteria.

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