LG BW 4040 UES

4"x40" Brackish Water | 2,700 GPD | 100 psi | 99.0% Rej | 85 ft2 | LG Chem RO Membrane

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LG BW 4040 UES
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LG Membrane Elements Seawater Brackish Water LG Chem
LG Chem Nano H2O LG BW 4040 UES Brackish Water (BWRO) Reverse Osmosis Membrane

LG BW 4040 UES Ultra Energy Saving Brackish Water RO membranes offer high permeability at low feed pressure significantly reducing operating costs; suitable for low salinity brackish water applications. 

LG Chem’s NanoH2O™ brackish water RO membranes serve various municipal and industrial applications and major utilities around the world. LG BWRO membranes, all incorporated with innovative Thin Film Nanocomposite (TFN) technology, are offered in industry standard configurations and can easily fit into existing and new RO plants.

LG BW 4040 UES Compatibility Information 

LG BW 4040 UES Membrane Element can be used as a replacement for the below membrane elements in your existing water treatment equipment.   Please note that additional hardware or adapters may be required - refer to the pressure vessel and element drawings, or contact us to verify.

  • FilmTec XLE-4040
  • Hydranautics ESPA4-4040
  • Toray MH10A



Specifications for LG BW 4040 UES

LG Chem Product: LG BW 4040 UES
Size (Approximate): 4" Dia. x 40"L
Flow Rate: 2,700 gpd (10.2 m³/d)
Applied Pressure: 100 psig (6.9 bar)
Stabilized Salt Rejection: 99.0%
Minimum Salt Rejection: 98.0%
Active Surface Area: 85 ft2  (7.9 m2)
Single Element Recovery: 15%
End Style: Standard Male PWT
Exterior: Hard Shell Fiberglass
Feed Spacer: 28 mil
Membrane Type:  Thin Film Nanocomposite
Can Replace Elements:

FilmTec XLE-4040
Hydranautics ESPA4-4040
Toray MH10A

Permeate flow and salt rejection based: 500 ppm NaCl feed stream, 77°F (25°C), 15% recovery, pH7, and 100 psig (6.9 bar).  Permeate flows for individual elements will vary with no less than 85% of the specified datasheet flow.

Product Specifications

Operating Limits for LG BW 4040 UES

Maximum Applied Pressure: 600 psig (41 bar)
Maximum Chlorine Concentration: < 0.1 ppm
Maximum Operating Temperature: 113°F (45°C)
pH Range, Continuous (Cleaning): 2-11 (2-12)
Maximum Feedwater Turbidity: 1.0 NTU
Maximum Feedwater SDI (15 min): 5.0
Maximum Feed Flow Rate: 16 gpm (3.6 m³/h)
Maximum Pressure Drop (ΔP) 
for Each Element:
15 psi (1.0 bar)

Benefits & Features of LG Brackish Water Reverse Osmosis Membranes

LG RO Membranes are NSF Certified

  • Improved permeate quality without increasing operating pressure
  • Reduced energy cost without sacrificing the permeate quality
  • LG Chem NanoH2O™ RO membranes are Standard 61 certified by NSF international for the production of drinking water.

Markets & Applications for LG Chem Reverse Osmosis Membranes

Power Generation
  • Boiler feed for steam generation 
  • Cooling tower makeup water 
  • FGD process makeup water
  • Treatment of cooling tower blowdown
  • Condensate polishing
  • NOx cooling water
  • Desalting water Cooling tower makeup 
  • Treatment of cooling tower blowdown
  • Boiler feed for steam generation 
  • Condensate polishing
  • Paint booths 
  • Electrocoat and phosphatizing lines 
  • Machining coolant makeup 
  • Parts rinsing
  • Cleaning and etching agents 
  • Chip fabrication 
  • Rinsing 
  • Silicon wafer dicing 
  • Cooling 
  • Clean room humidification
Food & Beverage
  • Bottled water 
  • Syrup blending
  • Flavor production
  • Boiler feed for steam production
  • Dairy and cheese making 
  • Coffee and tea production

Physical Dimensions of LG Chem LG BW 4040 UES

LG Membranes 4" Elements Drawing
A 40 (1016)
B 3.9 (100)
C 0.75 (19)
D 1.1 (29)

LG BW 4040 UES  fits nominal 4" ID pressure vessels.