Seawater desalination
Potable or industrial water production from open-intake or well-source seawater.
YiFu Trading
Seawater RO Membranes for Desalination Systems
High-rejection reverse-osmosis elements for seawater desalination systems designed around site salinity, temperature and pretreatment.
Product overview
RO elements designed for high-salinity feed water
Seawater RO membrane elements operate at higher osmotic pressure than typical brackish-water elements. Element selection is only one part of a desalination system.
Intake conditions, pretreatment, boron objectives, energy recovery, pressure vessels, materials and cleaning strategy must be engineered together.
Application fit
Typical roles and use cases
These are potential roles, not guaranteed performance claims. The complete process and verified product limits must be reviewed.
Marine and island systems
Compact desalination duties where feed variation and service access must be considered.
SWRO replacement
Cross-check of current model, pressure vessel, array and operating history.
Selection
What needs to be confirmed
- Feed salinity and ionic analysis
- Temperature range and seasonal variation
- Intake type and biological loading
- Pretreatment and SDI target
- Permeate quality including boron objective
- Design recovery and array configuration
- Operating pressure and energy recovery
- Materials and corrosion management
Important
Use approved supplier data
Do not select SWRO elements using only nominal rejection. Use a validated system projection and approved product data.
Technical parameters
Specifications to confirm before supply
| Parameter | Published value | Selection note |
|---|---|---|
| Reference models | YF-SW-4040 / YF-SW-8040 | Seawater RO reference models; confirm current grade and revision. |
| Nominal membrane area | 8.4 / 37 m² | YF-SW-4040 / YF-SW-8040 reference values. |
| Nominal permeate flow | 6.1 / 28.4 m³/day | Supplier laboratory reference, not a site production guarantee. |
| Nominal salt rejection | 99.8% | Reference test result under the stated catalogue conditions. |
| Reference test conditions | 32,000 ± 100 mg/L NaCl; 5.52 MPa; 25 ± 1°C; pH 7–8 | Reference recovery: 8% per element. |
| Maximum feed pressure | 8.27 MPa | Coordinate with pressure-vessel, pump, piping and energy-recovery design. |
| Reference pH and temperature | Operation pH 3–10; cleaning pH 2–12; up to 45°C | Confirm cleaning method and current datasheet. |
| Pretreatment reference limits | Turbidity ≤1 NTU; SDI15 ≤5; free chlorine ≤0.1 mg/L | Intake-specific pretreatment and validated projection are required. |
Selection note: Nominal element data is measured under controlled test conditions. Seawater temperature, salinity, boron objective, ageing and array recovery can materially change actual permeate flow and quality.
FAQ
Common selection questions
Can a brackish-water RO membrane be used for seawater?
Seawater duties normally require elements designed for higher salinity and pressure. A system projection is necessary.
Is one RO pass sufficient?
It depends on feed salinity, temperature and product-water objectives such as boron. Some projects require a second pass or pH adjustment.
What pretreatment is required?
The answer depends on intake and water quality. Media filtration, UF, coagulation or other steps may be used alongside chemical controls.
Send your application for a preliminary review
Share water data, flow, treatment objective or an existing membrane model. YiFu will coordinate the next technical questions.