As a professional manufacturer offering a full lineup of Liquid Filters, we provide complete one-stop filtration solutions for the water treatment industry. Our High Salt Rejection RO Membrane is a premium industrial reverse osmosis element specially engineered for high-standard water purification scenarios, especially for pharmaceutical production and semiconductor manufacturing where water purity is non-negotiable.
As a professional manufacturer offering a full lineup of Liquid Filters, we provide complete one-stop filtration solutions for the water treatment industry. Our High Salt Rejection RO Membrane is a premium industrial reverse osmosis element specially engineered for high-standard water purification scenarios, especially for pharmaceutical production and semiconductor manufacturing where water purity is non-negotiable.
In pharmaceutical ingredient batching and electronics wafer cleaning, even trace dissolved ions and organic contaminants will severely affect product yield and quality. Standard-grade RO membranes cannot meet these stringent purity requirements, while our high salt rejection RO element delivers stable and reliable filtration performance. Featuring a stabilized salt rejection rate of 99.5%–99.7%, it effectively removes dissolved salts, organics, colloids and suspended solids, consistently producing water that complies with USP Purified Water standards for pharmaceutical processing and ASTM Type II/III ultrapure water specifications for electronics manufacturing.
All membrane elements are produced under rigorous quality control in our ISO 9001:2015 certified production facility, ensuring long-term stable performance and excellent fouling resistance. Designed with an optimized flow channel structure, this high-rejection membrane effectively reduces concentration polarization on the membrane surface, lowering chemical cleaning frequency and minimizing overall operational costs for large-scale ultrapure water systems.
For detailed technical data and professional system matching guidance, please refer to our official product page.
This reverse osmosis membrane adopts a pressure-driven separation mechanism that combines physical sieving and electrostatic repulsion to achieve high-efficiency impurity removal. Its core filtration layer is a high cross-link density polyamide thin-film composite (TFC) layer. The compact cross-linked molecular structure forms uniform ultra-fine pores that intercept almost all dissolved salts, organic molecules and colloidal particles while allowing pure water molecules to pass through smoothly.
The core advantage of this high salt rejection membrane lies in its optimized polyamide synthesis formula. By upgrading the surface cross-linking density, the membrane achieves a tighter pore structure and a minimum stabilized salt rejection of 99.5% under standard test conditions. Under conventional brackish water operating pressure (200–600 psi), the element stably removes over 99.5% of dissolved ionic contaminants, fully satisfying the ultra-high purity demands of pharmaceutical and semiconductor production.
The membrane surface maintains a uniform and stable negative charge, which produces strong electrostatic repulsion against anionic impurities and negatively charged organic matter, further improving overall rejection efficiency. The dual protection of physical interception and electrostatic separation guarantees stable permeate water quality and consistent water flux during long-term continuous operation, greatly reducing performance attenuation and unplanned system downtime.
Different from low-energy RO membranes that reduce pressure by sacrificing rejection accuracy, this high-purity membrane prioritizes filtration precision. The reinforced dense polyamide layer ensures ultra-high salt rejection, while the 3D optimized feed spacer lowers internal hydraulic resistance, realizing a perfect balance between excellent separation performance and reasonable energy consumption.
All elements of this RO membrane series are manufactured in strict accordance with standardized industrial specifications:
Parameter | Specification |
|---|---|
Membrane Type | Polyamide Thin-Film Composite (TFC) |
Configuration | Spiral Wound |
Nominal Active Surface Area | 400 ft² (37.2 m²) |
Permeate Flow Rate | 10,500 – 12,000 GPD (39.7 – 45.4 m³/d) |
Stabilized Salt Rejection | 99.5% – 99.7% |
Standard Test Pressure | 225 psi (1.55 MPa) |
Maximum Operating Pressure | 600 psi (4.14 MPa) |
Maximum Operating Temperature | 113°F (45°C) |
pH Range (Continuous Operation) | 2.0 – 11.0 |
pH Range (Short-Term Chemical Cleaning) | 1.0 – 13.0 |
Maximum Feed Silt Density Index (SDI) | ≤5 |
Maximum Feed Turbidity | ≤1.0 NTU |
Free Chlorine Tolerance | < 0.1 ppm |
Design Service Life | 3–5 years (with qualified pretreatment and regular maintenance) |
Note: Individual element permeate flow fluctuation: ±10% of rated value. All salt rejection data is tested under standard brackish water conditions. Actual performance varies with feed water salinity, temperature and operating pressure.
Tailored for high-standard ultrapure water systems, this high salt rejection RO membrane offers four core competitive advantages:
1. Ultra-high and stable impurity removal performance
With a steady salt rejection rate of 99.5%–99.7%, the membrane consistently delivers water meeting USP purified water standards and semiconductor-grade ultrapure water requirements.
It effectively removes monovalent/divalent ions, soluble organics and colloidal contaminants, eliminating product defects caused by water quality instability and ensuring long-term stable production.
2. Excellent chemical tolerance and long service lifespan
The high-strength polyamide layer features outstanding acid and alkali resistance, supporting full-range chemical cleaning within pH 1.0–13.0. Standard CIP cleaning can effectively remove inorganic scaling, biofouling and organic deposits without damaging the membrane structure.
With qualified pretreatment and routine maintenance, the service life reaches 3–5 years, greatly reducing replacement frequency and long-term operational costs.
3. Standard universal size for easy retrofit & replacement
Adopting standard 8-inch (8040) spiral-wound dimension, the element is fully compatible with all mainstream RO pressure vessels on the market.
It can directly replace imported high-rejection membranes without any system modification, minimizing equipment downtime and renovation costs.
4. Optimized flow channel to resist fouling
The upgraded 3D feed spacer optimizes water flow distribution, alleviates surface concentration polarization, slows fouling accumulation, and extends cleaning cycles, effectively reducing cleaning agent consumption and labor costs.
This high salt rejection RO membrane is specially designed for industries requiring zero water quality fluctuation:
Pharmaceutical Manufacturing
Produces USP-standard purified water for pharmaceutical formulation, equipment rinsing and raw material preparation. Note: Single-pass RO cannot reach WFI grade; two-pass RO + EDI polishing system is required for Water for Injection.
Electronics & Semiconductor Industry
Supplies high-purity process water for wafer etching, chip cleaning and chemical dilution. It efficiently filters trace boron, silicon and heavy metal ions to guarantee wafer yield and product stability.
Other High-standard Scenarios
Power plant boiler makeup water, laboratory ultrapure water systems, and high-end food & beverage process water.
Pretreatment Requirements: Feed water SDI ≤5, Turbidity ≤1.0 NTU, Free Chlorine < 0.1 ppm. We recommend supporting facilities including multimedia filters, precision security filters and antiscalant dosing systems. You can find full-set pretreatment solutions in our Liquid Filters product series.
Every batch of RO membranes undergoes 100% full-performance testing before delivery, complying with global authoritative industry certifications:
ISO 9001:2015 – International Quality Management System Certification
NSF/ANSI 61 – Drinking Water System Component Safety Certification
GB/T 32359-2015 – National Standard for RO Membrane Performance Testing
CE Mark – EU Safety, Health and Environmental Compliance Certification
Each shipment is equipped with complete factory test reports, official datasheets and batch traceability records to support project acceptance and quality auditing.
Our High Salt Rejection RO Membrane is a cost-effective industrial-grade solution for pharmaceutical and semiconductor ultrapure water projects. It achieves performance comparable to top international brands in terms of high salt rejection, chemical stability and long service life, while offering a more competitive price advantage. With 99.5%–99.7% stable desalination efficiency, wide pH cleaning tolerance and 3–5 year service life, this spiral-wound RO element perfectly balances high water quality output and low operational investment. It is the ideal replacement option for imported high-end RO membranes in high-purity water treatment projects.
Q1: What is the difference between standard and high salt rejection RO membranes?
Standard brackish RO membranes offer 99.0%–99.3% salt rejection for general industrial desalination.
Our high salt rejection membranes adopt high-density cross-linked polyamide materials to achieve 99.5%+ rejection. Designed for high-precision purification, it delivers far more stable water quality for pharmaceutical and semiconductor critical processes.
Q2: Can single-pass RO produce 18.2 MΩ·cm ultrapure water?
No. Single-stage RO only achieves preliminary desalination. To reach 18.2 MΩ·cm laboratory/semiconductor-grade ultrapure water, a complete process of two-pass RO + EDI + mixed bed polishing is required.
This membrane serves as the core primary filtration unit for high-efficiency bulk desalination.
Q3: What is the actual salt rejection performance?
Under standard test conditions (225 psi pressure, 25°C temperature, 2000 ppm NaCl feed water), the stabilized salt rejection is 99.5%–99.7%. Each element is individually tested to ensure a minimum 99.5% rejection rate.
Q4: What water sources are suitable?
Applicable for municipal water and brackish water with TDS below 10,000 ppm. For seawater (TDS ≥30,000 ppm), please select our professional seawater RO membrane series.
Q5: What pretreatment is mandatory?
Feed water standards: SDI ≤5, Turbidity ≤1.0 NTU, Free Chlorine < 0.1 ppm. Standard configuration: multimedia filter + 5μm security filter + antiscalant dosing system.
Q6: Why cannot high-rejection membranes operate under ultra-low pressure?
Ultra-low-energy RO membranes adopt loose membrane structure to reduce pressure, but sacrifice filtration accuracy (max 99.3% rejection).
To achieve 99.5%+ high rejection, the membrane requires a dense high-crosslink structure, which needs standard 200–600 psi working pressure to maintain stable separation efficiency, meeting strict pharmaceutical and electronics water standards.
Q7: What is the membrane service life?
With qualified pretreatment and regular chemical cleaning, the stable service life is 3–5 years, consistent with international premium membrane standards.
Q8: How to choose the right RO membrane for ultrapure water systems?
Selection depends on required water purity, feed water TDS, and system operating pressure. This 99.5%+ high-rejection model is the best choice for pharmaceutical and semiconductor high-standard projects.
Our technical team can provide professional customized configuration solutions according to your on-site water quality data.
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