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Engineering planning tool

Industrial DI Water Specification & System Planner

Turn daily demand, production rate, operating time, storage and product-water quality into a preliminary DI-water treatment brief.

Calculation basis

Define the project inputs, then review the preliminary treatment route.

Capacity

Qavg = Vday ÷ trunQavg is the average DI-water production rate in m³/h, Vday is daily demand in m³/day, and trun is operating time in h/day. This assumes uniform production during the operating window and excludes downtime and reserve capacity.tmin = Vday ÷ Qsystemtmin is the minimum runtime in h/day, and Qsystem is the selected system production rate in m³/h. This assumes the stated rate is continuously available and excludes flushing, cleaning and performance derating.

Storage

Vbuffer = Vday × tbuffer ÷ 24Vbuffer is the calculated storage volume in m³, Vday is daily demand in m³/day, and tbuffer is the selected buffer time in hours. This assumes demand is evenly distributed across 24 hours and excludes distribution hold-up, fire reserve, unusable tank volume and contingency storage.

Water quality

At 25°C, resistivity in MΩ·cm is the reciprocal of conductivity in µS/cm. Enter either value and the planner calculates the other. TDS is not used as a fixed substitute for conductivity because the relationship varies with water composition.

Project inputs

Define the project requirement.

Fields marked with * are required. Calculations run in your browser, and project data is not sent when you calculate.

Demand and capacity
Feed water and product-water target
µS/cm
mg/L
µS/cm
MΩ·cm
Enter either conductivity or resistivity at 25°C; one value is sufficient. If you enter both, they must agree within 5%.
Supply, storage and site conditions
Known raw-water parameters

Review the project inputs, then calculate the planning result.

Planning result

Preliminary DI-water treatment brief

Required average production rate
—
Minimum daily runtime
—
Available daily capacity margin
—
Calculated buffer volume
—
Normalized product-water target
—
Preliminary treatment route
Insufficient data

Why this treatment route is suggested

  • Calculate the planning result to see why a treatment route is suggested.

Design data still required

Hardness, alkalinity, silica, iron, manganese, free chlorine, temperature, major ions, microbiology, recovery constraints and point-of-use requirements.

Engineering boundary

This planner provides preliminary capacity checks and a treatment route for project discussion. It does not replace feed-water analysis, a membrane projection, detailed equipment selection or a final process design. Before quotation, confirm feed-water chemistry and seasonal variation, design recovery, pretreatment, storage and distribution, and point-of-use quality requirements.

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Worked scenario

Municipal feed water: 10–12 m³/day at 1 m³/h.

With a 12-hour operating window, a 1 m³/h system can produce up to 12 m³/day. At 10 m³/day, the minimum runtime is 10 hours and the nominal daily capacity margin is 20%. At 12 m³/day, the minimum runtime is 12 hours and no nominal margin remains. A four-hour buffer based on 12 m³/day is 2 m³, before allowances for unusable tank volume, distribution hold-up or contingency. Available power: 480 V / 60 Hz / 3 phase.

Process matrix

How to interpret each treatment route

  • Single-pass RO: a preliminary route for lower-purity targets when final polishing is not required; confirm performance by membrane projection.
  • Double-pass RO: a conservative route while the final-polishing requirement is being confirmed.
  • RO + final polishing: a route that adds a specified final treatment step to meet the point-of-use quality requirement.
  • Double-pass RO + EDI: a route for high-resistivity water when continuous operation and EDI feed-water conditions can be confirmed.
  • Insufficient data: no treatment route is suggested until the feed-water source, product-water target and polishing requirement are consistent.

Compare RO, double-pass RO and RO + EDI selection inputs

Method & sources: USGS Specific Conductance · USGS TDS/conductivity relationship · DuPont EDI-310 Manual · Planner v1.0 · Last reviewed 15 August 2026