4040 LG RO membrane Model: BW 4040 R

1. What is the LG BW 4040 R used for?

It's a brackish water RO membrane designed for industrial, commercial, and municipal water treatment applications with high salinity feed water, including wastewater reuse.

2. What is the flow rate and salt rejection?

2,500 GPD (9.5 m³/d) permeate flow rate, with 99.6% stabilized salt rejection and a minimum guaranteed rejection of 99.3%.

3. What makes this different from a standard TFC brackish water membrane?

It uses LG Chem's NanoH2O Thin Film Nanocomposite (TFN) technology, which embeds nanoparticles in the polyamide layer to improve both flow permeability and fouling resistance together — a combination standard TFC membranes typically trade off against each other.

4. What is the difference between the BW 4040 R and BW 4040 ES?

Both are 4040-format brackish water membranes; the ES variant is built for higher flow/surface area at a modest trade-off in rejection tier, while the R (High Rejection) variant prioritizes maximum salt rejection. See the comparison table above for full model options.

5. What operating pressure and temperature does this membrane require?

Maximum operating pressure of 600 psi (41 bar), and maximum operating temperature of 45°C (113°F).

6. What feed water quality does this membrane require?

Maximum feedwater turbidity of 1.0 NTU, maximum SDI (15 min) of 5.0, and chlorine concentration below 0.1 ppm — proper pre-treatment protects the membrane and maintains rated performance.

7. Is this membrane suitable for seawater?

No — this is a brackish water membrane. For seawater desalination, see LG's SW 400 R or SW 400 ES models instead, built for much higher-salinity feed water.