Capacity
Required average production = daily demand ÷ operating hours. Minimum runtime = daily demand ÷ selected production rate.
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 brief.
Calculation basis
Inputs first. Candidate process second.
Storage
Buffer volume = daily demand ÷ 24 × selected buffer hours. It does not include distribution, fire reserve or unusable tank volume.
Water quality
At the same reference temperature, resistivity in MΩ·cm is the reciprocal of conductivity in µS/cm. TDS alone is not converted into a precise conductivity.
Planning result
Preliminary project brief
- Required average rate
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- Minimum runtime
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- Daily capacity margin
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- Calculated buffer volume
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- Normalized quality target
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- Preliminary process candidate
- Insufficient data
Why this candidate
- Calculate to see the selection reasoning.
Missing formal design data
Hardness, alkalinity, silica, iron, manganese, free chlorine, temperature, major ions, microbiology, recovery constraints and point-of-use requirements.
Engineering boundary
This is a planning screen, not a membrane projection, equipment selection, performance guarantee or final design. Confirm feed-water chemistry, seasonal variability, recovery, pretreatment, distribution and use-point requirements before quotation.
Worked scenario
Municipal feed, 10–12 m³/day and a 1 m³/h production target.
At 12 operating hours/day, a 1 m³/h system produces 12 m³/day gross. For 10 m³/day, minimum runtime is 10 hours and gross daily margin across the 12-hour window is 20%; for 12 m³/day, minimum runtime is 12 hours with no gross margin. A four-hour buffer based on 12 m³/day equals 2 m³. Site power: 480 V / 60 Hz / 3 phase.
Process matrix
How to interpret the candidate.
- Single-pass RO: least-complex screen when polishing is not required; verify by projection.
- Double-pass RO: conservative screen while final polishing remains uncertain.
- RO + polishing: the use-point target requires a defined final barrier.
- Double-pass RO + EDI: high-resistivity, continuously polished water is requested and EDI feed chemistry can be confirmed.
- Insufficient data: source or target is missing, inconsistent or invalid.
Technical sources
Primary references used by this planner.
- U.S. Geological Survey, Specific Conductance, Techniques and Methods 9-A6.3 — conductivity depends on the types and quantities of dissolved substances; current version reviewed 15 August 2026.
- U.S. Geological Survey, Yellowstone River Basin water-quality assessment — TDS-to-conductivity factors vary with water composition; reviewed 15 August 2026.
- DuPont EDI-310 Module Technical Manual, Form 45-D01915-en, Rev. 1 — RO-permeate feed, high-resistivity product range and required EDI feed checks; reviewed 15 August 2026.
Planner version: 1.0 · Last reviewed: 15 August 2026