Free browser-based calculator

Reverse Osmosis Recovery and Reject-Water Calculator

Estimate feed and reject volume from entered product demand and recovery.

Project inputs

Change the assumptions to explore an early planning scenario.

Planning result

Enter your assumptions

  • Feed volume per day
  • Product volume per day
  • Reject volume per day
  • Annual reject-water cost

How to use this result

Use the recovery supplied by a qualified designer for the actual feed water and membrane system.

Not a design tool

Recovery affects fouling, quality and membrane performance.

Discharge

Concentrate disposal requirements vary by location and chemistry.

Important: Costs, utility rates, permits, inspections, environmental duties, health requirements, safety rules and equipment standards vary by country, province or state, municipality, building use, equipment type and project scope. Qualified local professionals and the authority having jurisdiction must determine what applies. Water appearance, taste or a single test result cannot establish safety. Treatment must be selected from appropriate testing, intended use, local health requirements and qualified professional review. This site does not diagnose contamination or certify water as safe.