Calculator
RO Recovery Calculator
Calculate reverse osmosis recovery percentage and reject flow from feed and permeate flow.
Calculator Inputs
Feed flow must be a valid number.
Permeate flow must be a valid number.
Legend
RO recovery legend
RO recovery shows the percentage of feed water converted into permeate. Reject flow is the remaining flow discharged or returned depending on system design.
Input meaning
- Feed flow: total water entering the RO membrane system.
- Permeate flow: product water leaving the RO system for use or storage.
Result interpretation
- Higher recovery can reduce water waste but may increase scaling or membrane stress.
- Reject flow helps estimate drainage, pretreatment loading, and water consumption.
Assumptions
- Feed and permeate are measured at the same operating condition.
- Meters are calibrated and readings are stable.
- Water quality and membrane limits are reviewed separately.
Biomedical use
- Useful for dialysis WRO review, membrane performance trending, pretreatment sizing, and service report checks.
How to identify the required values
Use these examples to choose values from gauges, labels, manuals, datasheets, or service reports.
| Field | Example value | Tip |
|---|---|---|
| Feed flow | Feed rotameter reads 20 L/min. | Read when the RO is stable and producing water, not during startup or flush. |
| Permeate flow | Product/permeate flowmeter reads 12 L/min. | Use the product-water flow to the tank or loop; do not confuse with reject/concentrate flow. |
Input Checklist
Confirm these values before relying on the output for procurement, PM, or service planning.
- Feed flow
- Permeate flow
Safety And Engineering Notes
Use calculator outputs as planning estimates and verify critical systems with calibrated measurement or qualified engineering review.
- Dialysis water system settings must follow local water quality and manufacturer requirements.
- Do not optimize recovery without reviewing scaling, membrane performance, and water quality.