SW Series seawater desalination reverse osmosis membrane elements are designed for stable, high-rejection desalination of seawater and high-salinity feed water.
They deliver reliable permeate quality and long-term operational performance under high pressure and demanding marine conditions.
SW Series - Seawater Desalination RO Membrane Elements
The SW Series membranes utilize an advanced aromatic polyamide composite separation layer engineered for precise salt rejection and controlled water permeability.
The membrane structure is optimized to withstand high operating pressure while maintaining stable flux and rejection performance, making it suitable for long-term seawater desalination and high-salinity industrial applications.
Key Features
Typical Applications
Water Sources
• Seawater
• High-salinity brackish water
• Industrial saline water
Industries & Systems
• Seawater desalination plants
• Power plant boiler make-up water systems
• Industrial water supply and process water treatment
• Wastewater reuse and high-value substance concentration and recovery
• Food, pharmaceutical, and specialty chemical processing systems
Membrane Element Working Principle (RO)
Step 1 – Feed Water Inlet
Seawater enters the membrane element under high pressure.
Step 2 – Membrane Separation
Water molecules pass through the semi-permeable membrane, while salts and dissolved solids are rejected.
Step 3 – Permeate Collection
Desalinated water is collected through the central permeate tube.
Step 4 – Concentrate Discharge
Concentrated brine exits the element for further treatment or discharge.
Step 5 – Continuous Operation
The system operates continuously with stable rejection and flux performance.
Technical Specifications
Product Dimensions
| Dimensions | in. (mm) |
| A | 40 (1016) |
| B | 7.9 (201) |
| C | 1.05 (26.7) |
Product Parameters
The following performance data is based on standard testing conditions. Actual performance may vary depending on feed water quality and operating parameters.
| Model |
Permeate Flow |
Stable Rejection | Effective Membrane Area |
Feed Spacer Thickness | ||
| GPD | m3/d | % | ft2 | m2 | mil | |
| SW8040XHR-400 | 6000 | 22.7 | 99.85 | 400 | 37.2 | 28 |
| SW8040XHR-440 | 6600 | 25.0 | 99.85 | 440 | 40.9 | 28 |
| SW8040FR-400 | 8200 | 31.0 | 99.8 | 400 | 37.2 | 34 |
| SW8040HR-400 | 7500 | 28.4 | 99.8 | 400 | 37.2 | 28 |
| SW8040HR-440 | 8250 | 31.2 | 99.8 | 440 | 40.9 | 28 |
| SW8040LE-400 | 9000 | 34.0 | 99.8 | 400 | 37.2 | 28 |
| SW8040LE-440 | 9500 | 35.9 | 99.8 | 440 | 40.9 | 28 |
| SW8040XLE-400 | 11000 | 41.6 | 99.7 | 400 | 37.2 | 28 |
| SW8040XLE-440 | 12100 | 45.8 | 99.7 | 440 | 40.9 | 28 |
| Testing Conditions | Operating pressure 800 psi (5.52 MPa) |
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| Tested at 32000 mg/L NaCl solution |
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| Temperature at 25℃ |
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| pH 8.0 |
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| Recovery rate at 8% |
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Minimum salt rejection SW8040XHR-400 & SW8040XHR-440 99.75% SW8040FR-400 & SW8040HR-400 & SW8040HR-440 & SW8040LE-400 & SW8040LE-440 99.7% SW8040XLE-400 & SW8040XLE-440 99.6% |
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| Operating Conditions & Limits |
Maximum operating pressure | 1200 psi (8.28 MPa) |
| Maximum feedwater flow | 8040-75 gpm (17 m³/h) | |
| Maximum feedwater temperature | 45℃ | |
| Maximum feedwater flow SDI15 | 5 | |
| Maximum concentration of free chlorine | <0.1 mg/L | |
| Maximum pressure drop per element | 15 psi (0.1MPa) | |
| Allowed pH range for chemical cleaning | 1-13 | |
| Allowed pH range for feedwater in operation | 2-11 | |
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