LG (LG Chem) membrane products cover both brackish water and seawater duties. The model system is distinguished by prefix: BW brackish water, SW seawater, NF nanofiltration; the following number is the membrane area (400/440 ft²), and the letter indicates positioning—R standard rejection, ES low energy, GR high rejection, SR very high rejection, AFR fouling resistant.
Because the model count is small, selection at LG is correspondingly simple: first fix the water type (BW/SW), then the energy class (R/ES) or the rejection class (GR/SR), and finally the area, 400 or 440.
Series
| Series | Positioning | Representative models | Typical application |
|---|---|---|---|
| BW R | Brackish water standard | BW 400 R, BW 440 R, BW 400 R Dura | Industrial pure water, packaged systems |
| BW ES | Low energy | BW 400 ES, BW 440 ES | Low salinity, energy-sensitive projects |
| BW AFR | Fouling resistant | BW 400 AFR, BW 400 AFR G2 | Surface water, reclaimed water |
| SW GR/ES | Seawater desalination | SW 400 GR, SW 400 ES, SW 400 SR | Single-pass seawater desalination |
| NF | Nanofiltration | NF 400, NF 9 | Softening, decolourisation, partial demineralisation |
Representative models and parameters
The table below lists representative 8040 format models of this brand in the element library (membrane area per element 365–510 ft²), sorted from largest to smallest area; this format has 34 elements in total. The full model list can be filtered by brand in the design tool.
| Model | Membrane area ft² | Stabilised salt rejection | Category |
|---|---|---|---|
| BW 440 ES | 440 | 99.6% | Brackish water RO |
| BW 440 ES G2 | 440 | 99.7% | Brackish water RO |
| BW 440 ES L | 440 | 99.6% | Brackish water RO |
| BW 440 R | 440 | 99.6% | Brackish water RO |
| BW 440 R Dura | 440 | 99.7% | Brackish water RO |
| BW 440 R G2 | 440 | 99.8% | Brackish water RO |
| BW MOST+ | 440 | 98.5% | Brackish water RO |
| SW 440 ES | 440 | 99.8% | Seawater desalination |
| SW 440 GR | 440 | 99.8% | Seawater desalination |
| SW 440 GR G2 | 440 | 99.9% | Seawater desalination |
| SW 440 R | 440 | 99.8% | Seawater desalination |
| SW 440 R G2 | 440 | 99.9% | Seawater desalination |
| SW 440 SR | 440 | 99.8% | Seawater desalination |
| SW 440 SR G2 | 440 | 99.9% | Seawater desalination |
| BW 400 AFR | 400 | 99.6% | Brackish water RO |
| BW 400 AFR G2 | 400 | 99.7% | Brackish water RO |
| BW 400 ES | 400 | 99.6% | Brackish water RO |
| BW 400 ES G2 | 400 | 99.7% | Brackish water RO |
How to select
- General brackish water: BW 400 R, balanced parameters, good replacement compatibility.
- Energy priority: BW 400 ES, operating pressure markedly lower than the standard model.
- Seawater: SW 400 GR (99.85%) or SR (higher rejection), chosen by the permeate TDS requirement.
- Softening rather than demineralisation: NF 400, retains part of the monovalent ions and reduces the concentrate discharge load.
The LG official software is LG Q+, and the project file is .qplus. This site lists 38 LG elements that can take part directly in comparison under identical conditions.
Official contact
| Official website | www.lgchem.com |
|---|
LG's water treatment business does not publish a direct-dial number for China; contact via the official website or an authorised distributor is recommended.
FAQ
Which country is LG's reverse osmosis membrane from?
LG of South Korea (LG Chem); membrane products cover brackish water, seawater and nanofiltration.
What is the difference between BW 400 R and BW 400 ES?
R is the standard rejection type and ES the low-energy type; the latter runs at lower pressure with slightly lower rejection, and suits cases with high electricity cost or moderate salinity.
What design software does LG use for its membranes?
LG Q+, a Windows desktop application; project files use the .qplus extension.
Can LG's 440 ft² and 400 ft² elements be mixed?
They fit into the same housing size, but different areas change the permeate distribution of each element. Mixing within one pressure vessel is not recommended; when replacing, the whole array should be recalculated.
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