Product Overview
Seawater desalination has become the most reliable solution for offshore facilities, coastal communities, island water supply and industrial high-salinity wastewater treatment. Ordinary brackish water RO membranes cannot withstand the high osmotic pressure of natural seawater, resulting in low water production, rapid performance decay and frequent membrane replacement. As a professional global supplier of original DOW FILMTEC membrane elements, LEFILTER provides 100% authentic DOW SW30-4021 seawater reverse osmosis membranes, delivering high-efficiency, stable and cost-effective desalination solutions for commercial and industrial small-to-medium water treatment projects worldwide.
The DOW SW30-4021 seawater RO membrane adopts advanced aromatic polyamide thin-film composite (TFC) material, which is the core technology of DOW FILMTEC premium seawater series. Compared with the 2.5-inch small-size SW30-2521 model, the SW30-4021 upgrades to a 4-inch large-diameter structure with larger effective membrane area and significantly higher water flux. Its nominal water production reaches 800 GPD, which perfectly balances high water yield and ultra-high desalination accuracy. The stabilized salt rejection rate is up to 99.5%, ensuring stable production of high-purity fresh water even under long-term high-pressure seawater operation.
All SW30-4021 seawater membranes supplied by LEFILTER are original imported products with complete factory test reports, traceable batch codes and standard factory packaging. We maintain sufficient spot inventory all year round, supporting global small-batch trial orders and bulk wholesale orders. With strict quality inspection before delivery, we effectively avoid counterfeit and low-performance membrane problems, helping global customers reduce equipment failure rate and long-term operating costs. This model is compatible with all standard 4-inch FRP membrane housings on the market, requiring no equipment modification and realizing fast replacement and system upgrade.
Core Technical Advantages
1. Higher Salt Rejection & Superior Purification Performance
The DOW SW30-4021 seawater membrane achieves a stabilized salt rejection rate of 99.5%, which is higher than most ordinary seawater RO membranes. With an ultra-fine membrane pore structure, it can effectively intercept dissolved sodium chloride, magnesium salts and various mineral components in seawater, as well as harmful substances such as heavy metal ions, bacteria, microorganisms, colloidal suspended solids and organic pollutants. Whether used for offshore drinking water preparation or coastal industrial high-salinity wastewater treatment, it can stably produce qualified fresh water and meet international water quality and environmental discharge standards.
2. Large Water Flux & Commercial-Grade Water Supply Capacity
Benefiting from the optimized 4-inch large-area membrane layout, the SW30-4021 provides a rated water yield of 800 GPD, which is nearly twice the flow rate of small-size 2.5-inch seawater membranes. It perfectly meets the water demand of medium-sized desalination equipment, small island community water stations, offshore working platforms and commercial coastal water purification systems. While ensuring high water production, the membrane maintains stable desalination performance without rapid flux attenuation, realizing long-term continuous and efficient water supply.
3. High Pressure Resistance & Excellent Operational Stability
The SW30-4021 is designed for harsh seawater working environments, supporting a maximum operating pressure of 800 PSI. The reinforced fiberglass shell and high-strength polyester backing effectively resist high-pressure impact and water flow scouring, avoiding common problems such as membrane layer delamination, surface damage and center tube leakage of inferior membranes. With an ultra-low factory failure rate, it can operate continuously and stably for a long time, greatly reducing system maintenance frequency and replacement costs for end users.
4. Flexible Energy-Saving Operation & Strong Environmental Adaptability
This DOW seawater membrane supports both standard high-pressure full-load operation and low-pressure energy-saving operation. For medium-salinity seawater and brackish water with TDS below 30000ppm, properly reducing the system working pressure can save more than 20% of electric energy consumption, effectively reducing the operating cost of water pump and generator equipment. Meanwhile, the membrane features wide temperature and pH adaptability, stable operation in complex water quality environments, and strong anti-pollution performance, suitable for various global coastal and offshore project conditions.
Filtration Precision, Working Temperature & Application Fields
Filtration Precision: This SW30-4021 seawater RO membrane adopts ultra-precise thin-film filtration structure with a pore size of 0.0001–0.001 μm and a stable salt rejection rate of 99.5%, accurately removing dissolved salts, heavy metals, bacteria, viruses and organic impurities in seawater.Operating Temperature: It supports stable long-term operation within 5°C to 45°C, with a standard rated temperature of 25°C and a maximum continuous working temperature of 45°C.Application Fields: Widely used in medium-scale seawater desalination, offshore platform and large ship watermaking, island community water supply, commercial coastal water purification, high-salinity industrial wastewater pretreatment and medium-sized mobile desalination equipment.
LEFILTER Professional Service Support
As a reliable long-term supplier of original DOW FILMTEC RO membranes, LEFILTER provides one-stop full-cycle services for global customers purchasing SW30-4021 membranes. Our professional engineering team offers free pre-sales water quality analysis, model selection consultation and system parameter optimization solutions. Sufficient spot stock ensures fast global delivery within 3–7 working days. Each batch of products is equipped with original factory test certificates, installation manuals, cleaning guidelines and technical parameter sheets. We provide 24/7 remote after-sales guidance, including equipment commissioning, daily maintenance, fault troubleshooting and membrane cleaning instructions, helping customers maximize membrane service life and stabilize system water production efficiency. We have established long-term cooperative partnerships with water treatment distributors, equipment manufacturers and engineering companies in more than 60 countries, winning wide recognition with genuine quality and professional services.
FAQs About DOW SW30-4021 Seawater RO Membrane
Q1: What is SW30-4021, and what does the SW prefix mean?
A1: SW30-4021 is a commercial-grade DOW seawater reverse osmosis membrane. SW stands for Seawater, which means it is specially designed for high-salinity seawater desalination, not applicable to ordinary brackish water and tap water purification scenarios.
Q2: What is the salt rejection rate and filtration accuracy of SW30-4021?
A2: The SW30-4021 seawater membrane provides a stable salt rejection rate of 99.5% with ultra-fine 0.0001–0.001μm pore size, effectively removing sea salt, heavy metals, bacteria and organic pollutants to produce high-purity fresh water.
Q3: What is the difference between SW30-4021 and SW30-2521?
A3: SW30-4021 is a 4-inch medium-flow commercial model with 800 GPD water yield, higher flux and larger water supply capacity, suitable for medium-sized desalination systems; SW30-2521 is a 2.5-inch small-flow model for mini ship and portable watermakers.
Q4: What are the main application scenarios of SW30-4021?
A4: It is widely used for medium-scale seawater desalination, large ship and offshore platform water production, island residential water supply, commercial coastal water treatment and industrial high-salinity wastewater pretreatment.
Q5: What is the working temperature range of SW30-4021?
A5: The operating temperature ranges from 5°C to 45°C, with 25°C as the standard test temperature and 45°C as the maximum continuous working temperature, adapting to most coastal and offshore ambient conditions.
Q6: Can SW30-4021 work under low pressure to save energy?
A6: Yes, the SW30 series supports flexible low-pressure operation properly. For medium-salinity seawater, it can reduce over 20% power consumption without affecting water quality, realizing energy-saving and low-cost operation.
Q7: What services does LEFILTER offer for SW30-4021 buyers?
A7: LEFILTER provides free technical consultation, model selection guidance, fast spot delivery, complete original certification documents, installation and maintenance tutorials, and lifelong remote after-sales technical support for all SW30-4021 customers.
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