Purified Water System Calculator|RO EDI Recovery Calculation
Measured Inputs (enter known values)
Measured by flowmeter or design
Measured permeate from RO1
If single pass, enter same as RO1 permeate
Measured product after EDI / polishing
If unknown, enter lab value or estimate
Use conductivity meter reading
Optional but used for scaling risk flags
Helpful for pharma compliance checks (if available)
Resin volume before regeneration (design)
How often softener is regenerated
Typical 10–15 kg/m³ per regen (adjust as your practice)
Often 8–12% NaCl brine
Pre-treatment disinfection (mg/L)
Commercial bleach strength (5–12%)
If using ozone; mg/L
RO membrane differential pressure (monitor for fouling)
For hydraulic power estimate
Used for daily dosing & energy
For OPEX calcs
Quick tips
• Enter measured permeate flows — recovery will be computed automatically.
• If you only have RO1 measured, enter same value into RO2 / EDI to bypass stages.
• Adjust salt_kgm3 based on your plant practice (10–15 kg/m³ typical).
Performance Summary
Feed Flow
-
RO1 Permeate
-
RO1 Reject
-
RO2 Permeate
-
RO2 Reject
-
EDI Permeate
-
EDI Reject
-
Overall Recovery
-
Stage recovery (visual)
-
RO2 recovery
-
EDI recovery
-
Energy & OPEX Estimates
Pump hydraulic kW
-
Daily kWh
-
Energy cost / day
-
Energy ₹/m³ product
-
Pretreatment & Chemicals
Salt / regen (kg)
-
Brine volume (L)
-
Backwash / regen water (m³ per regen)
-
Chlorine required (g/day)
-
NaOCl L/day (@strength)
-
Ozone g/hr
-
Quality Checks & Alerts
No critical alerts.
Standards & thresholds used
• USP / ISPE style quick checks: EDI product conductivity target ≤ 1.3 µS/cm @25°C; TOC <= 500 ppb for many pharma utilities (adjustable).
• RO ΔP > 2 bar suggests fouling; RO1 recovery < design by >10% suggests fouling or feed change.
• Softener salt use and brine rules: salt_kg = resin_m3 × salt_kgm3; brine L ≈ salt_kg × (100/ brine_pct) * (approx factor) — uses 10% default for quick rule.