RO membrane selection is the single most important decision in designing an RO system. The wrong choice costs you in energy, recovery rate, and replacement cycles.
Key Selection Parameters
- Salt rejection rate (NaCl %): Higher is better for desalination; 99.5%+ for industrial
- Permeate flux (LMH): Governs membrane area needed
- Operating pressure (bar): Higher TDS requires higher pressure
- Temperature range: Affects flux and rejection
Membrane Types and Applications
| Type | TDS Range | Application |
|---|---|---|
| BW (Brackish Water) | 500–5,000 mg/L | Industrial RO, DM plants |
| NF (Nanofiltration) | 200–1,000 mg/L | Hardness removal, colour removal |
| SWRO | Up to 45,000 mg/L | Seawater desalination |
| UF | N/A (particulate) | MBR, pre-treatment |
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