Reverse Osmosis (RO) System Sizing Calculator
Quickly estimate the right reverse osmosis system size, membrane count, and operating flows for your application.
Built for engineers, plant managers, and facility operators looking for fast preliminary sizing.
RO System Sizing Calculator
Estimate system size, feed flow, and membrane configuration.
!!disclaimer!!
These calculations are for reference only and may not be 100% accurate. If you need assistance on verifying calculations or help with your system, please contact Complete Water Solutions technical support team.
Sizing a reverse osmosis system correctly is critical to performance, efficiency, and long-term operating cost.
Oversized systems waste capital. Undersized systems lead to downtime, poor recovery, and excessive membrane fouling.
This calculator gives you a fast, real-world estimate of:
- Required system capacity (GPD)
- Feed flow and reject flow rates
- Membrane quantity and vessel count
- Design flux and membrane loading
This calculator is designed for:
- Industrial facilities evaluating new RO systems
- Engineers doing preliminary system design
- Maintenance teams planning upgrades or replacements
- Anyone needing a fast budgetary estimate before a full engineering review
Enter your production requirements, operating schedule, and basic water quality assumptions below to generate a recommended RO system size.
The results provided are based on standard industry assumptions and are intended for preliminary design only.
Key outputs include system size, membrane count, and operating flow rates.
Final system design should always consider:
- Full water chemistry analysis
- Scaling and fouling potential
- Pretreatment requirements
- Temperature correction factors
- Site-specific operating conditions
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