LG BW 4040 R 2,500 GPD at 225 PSI 4 x 40 inch 99.6% Rejection Brackish Water Membranes

LG Water Solutions BW 4040 R High Rejection Brackish Water RO Membrane (2,500 GPD)

The LG Water Solutions (a business unit of LG Chem) LG BW 4040 R is a high-rejection, brackish water reverse osmosis (RO) membrane engineered for demanding industrial and commercial water treatment applications. Manufactured utilizing LG's proprietary Thin-Film Nanocomposite (TFN) technology, this 4-inch by 40-inch spiral-wound element features benign nanomaterials embedded directly into the polyamide layer. This advanced membrane chemistry significantly increases permeability and structural durability while maintaining superior salt rejection. It is widely specified for high-salinity brackish water purification, wastewater reuse, and mission-critical municipal utilities where consistent, long-lasting performance is required.

Designed for seamless integration into standard 4040 commercial pressure vessels, the LG BW 4040 R delivers a highly efficient permeate flow rate of 2,500 GPD (9.5 m³/d) with a stabilized salt rejection of 99.6%. The element features an 85 square-foot active membrane area and utilizes a standard 28-mil feed spacer to balance internal flow dynamics and minimize particulate fouling. Operating reliably at a standard test pressure of 225 PSI, this robust RO membrane safely accommodates a maximum applied pressure of 600 PSI and a continuous liquid temperature up to 113°F. By combining industry-leading nanocomposite materials with intrinsic anti-fouling properties, this membrane delivers the high-purity water required for continuous-duty operations.