DOW BW30 PRO-4040 High Flow Brackish Water RO Membrane | LEFILTER

Product Overview

The DOW BW30 PRO-4040 is a premium 4-inch large-flow brackish water reverse osmosis membrane upgraded by DuPont FilmTec, designed specifically for medium and large-scale commercial and industrial water treatment systems. As the high-flow version of the PRO series, this model breaks the water yield limit of traditional 2.5-inch membrane elements, featuring larger effective membrane area, higher water flux and more stable desalination performance. It is widely recognized as an upgraded industrial solution for tap water, groundwater, well water and low-salinity brackish water purification, perfectly solving common problems of traditional RO membranes such as insufficient water output, easy fouling and unstable water quality in long-term industrial operation.

Different from SW series seawater membranes for high-salinity brine, BW (Brackish Water) series membranes focus on conventional raw water desalination and deep purification. The BW30 PRO-4040 further optimizes membrane structure and hydrophilic coating based on classic BW30 technology, achieving higher rejection rate, stronger anti-pollution ability and wider chemical cleaning adaptability. With standard 4.0×40 inch industrial size, it is compatible with all mainstream 4-inch FRP membrane housings on the market, supporting direct replacement and system capacity upgrade without pipeline modification and equipment renovation.

As a reliable supplier of original DOW RO membranes, LEFILTER provides 100% authentic BW30 PRO-4040 membrane elements with complete factory test reports, traceable batch codes and standard dry membrane packaging. We maintain sufficient spot inventory all year round, supporting global small-batch trial orders and bulk container wholesale. Every product is strictly inspected before delivery to ensure stable performance, helping industrial water treatment projects maintain long-term efficient and low-consumption operation.

Core Technical Specifications

Filtration Precision: Adopting advanced aromatic polyamide thin-film composite structure with 0.0001–0.001 μm ultra-fine pore size, the BW30 PRO-4040 delivers a stabilized salt rejection rate of up to 99.7%, effectively intercepting dissolved salts, heavy metal ions, colloids, bacteria, viruses and organic pollutants in brackish water to produce high-purity industrial and commercial pure water.

Operating Temperature: The membrane supports stable continuous operation within 5°C to 45°C, with 25°C as the standard test temperature. The maximum continuous working temperature is 45°C, adapting to complex ambient temperature changes of indoor factory water rooms and outdoor commercial water treatment stations.

Applicable Water Quality & Fields: Suitable for various low-TDS brackish water with TDS below 5000ppm, including municipal tap water, underground well water, river surface water and light industrial recycled water. Widely applied in industrial boiler feed water, electronic ultrapure water pretreatment, food and beverage production water purification, commercial centralized water supply, municipal water treatment and industrial wastewater reuse projects.

Key Performance Advantages

1. High Water Flux & Large Water Production Capacity

Compared with 2.5-inch BW30 PRO-2540 membrane, the 4-inch BW30 PRO-4040 has a greatly increased effective membrane area and rated water yield. It can provide stable large-flow water supply for medium and large water treatment equipment, significantly improving system water production efficiency. For industrial factories, commercial water plants and centralized water supply projects, it can effectively reduce the number of membrane elements required for unit water output, saving equipment installation space and overall project investment cost.

2. 99.7% High Stable Salt Rejection

Upgraded PRO-level membrane formula ensures ultra-high desalination accuracy and stable water outlet quality. Under standard operating conditions, the stabilized salt rejection reaches 99.7%, which is significantly higher than ordinary commercial RO membranes. It can effectively reduce water conductivity, stably remove various soluble impurities in raw water, and maintain consistent high water quality for a long time, fully meeting the strict water standard requirements of industrial production and commercial drinking water.

3. Enhanced Anti-Fouling & Long Service Life

The BW30 PRO-4040 adopts optimized hydrophilic surface treatment and scientific feed spacer design, which reduces the adhesion of sediment, biological slime and organic pollutants on the membrane surface. In the face of complex raw water quality such as well water and river water, it is not easy to block and pollute. It effectively reduces the frequency of system shutdown cleaning, maintains stable water flux for a long time, and extends the overall service life of membrane elements, greatly reducing daily operation and maintenance costs.

4. Ultra-Wide Chemical Cleaning Tolerance

This upgraded industrial membrane supports a wide pH cleaning range of 1–13, which can withstand strong acid and strong alkali chemical cleaning. Users can thoroughly clean inorganic scaling, organic pollution and microbial fouling generated during long-term operation. The membrane performance can be fully restored after cleaning without irreversible damage, realizing repeated stable use and improving the economic benefit of the water treatment system.

5. Dry Membrane Design for Global Delivery

All BW30 PRO-4040 membranes adopt dry membrane preservation technology without preservative liquid. Compared with traditional wet membranes, they have lighter weight, lower transportation cost and no liquid leakage risk during long-distance international transportation. The unused dry membrane has a long storage period and can quickly stabilize water yield and desalination rate after installation, with no performance attenuation, which is very suitable for global engineering project delivery and after-sales replacement.

Industrial & Commercial Application Scenarios

Thanks to its large flow, high precision and strong stability, the BW30 PRO-4040 has become the preferred core membrane element for medium and large water treatment systems. In industrial fields, it is widely used for boiler make-up water in power and chemical industries, production pure water in food, beverage and electronic industries, and desalination and reuse of light industrial circulating wastewater. In commercial and municipal fields, it is applied to community centralized water supply, hotel and school water purification equipment, rural brackish water desalination and municipal tap water deep treatment. It can stably adapt to long-term continuous industrial operation and high-demand commercial water supply scenarios.

LEFILTER Professional Service & Supply Strength

LEFILTER has long been committed to providing global customers with original high-performance DOW/ DuPont RO membrane solutions. For BW30 PRO-4040 membrane users, we provide one-stop full-cycle services including pre-sales technical consultation, water quality analysis, personalized model selection, fast spot delivery, complete document support and after-sales remote guidance. All products are original and authentic with guaranteed quality. We support customized system parameter debugging suggestions according to customer raw water conditions, helping maximize membrane operation efficiency and service life. With stable supply capacity and professional technical support, we have won long-term trust and cooperation from customers in more than 60 countries worldwide.

FAQs – DOW BW30 PRO-4040 RO Membrane

Q1: What is BW30 PRO-4040 used for? Is it different from seawater membranes?

A1: BW30 PRO-4040 is a high-flow industrial brackish water RO membrane, specially designed for tap water, well water and low-salinity water treatment. It differs from SW series seawater membranes and is not suitable for high-TDS seawater desalination, focusing on commercial and industrial conventional water purification.

Q2: What is the filtration precision and salt rejection rate of BW30 PRO-4040?

A2: It features an ultra-fine filtration pore size of 0.0001–0.001 μm and a stabilized salt rejection rate of 99.7%, which can efficiently remove salts, heavy metals, bacteria and organic impurities to produce high-standard pure water.

Q3: What is the difference between BW30 PRO-4040 and BW30 PRO-2540?

A3: BW30 PRO-4040 is a 4-inch large-flow model with higher water production and larger membrane area, suitable for medium and large industrial water treatment systems; BW30 PRO-2540 is a 2.5-inch small-flow model for small commercial equipment.

Q4: What temperature range can this membrane work stably in?

A4: The BW30 PRO-4040 operates stably within 5°C–45°C, with a standard test temperature of 25°C, adapting to most indoor industrial workshops and outdoor commercial water treatment environments.

Q5: Why choose PRO upgraded version instead of ordinary BW membrane?

A5: The PRO upgraded version has higher desalination rate, stronger anti-fouling performance, wider pH cleaning tolerance and more stable long-term operation, effectively reducing maintenance frequency and replacement cost for industrial systems.

Q6: Is BW30 PRO-4040 suitable for long-term continuous industrial operation?

A6: Absolutely yes. It adopts reinforced structural design and anti-pollution coating, with ultra-low performance attenuation rate, supporting 24-hour continuous stable operation, which fully meets the demand of industrial uninterrupted water supply.

Q7: What services can LEFILTER provide for BW30 PRO-4040 buyers?

A7: LEFILTER provides free pre-sales model selection, fast global delivery, original factory certificates, installation and cleaning guidelines, and 24/7 remote after-sales technical troubleshooting support.

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