Low Energy RO Membranes

Low Energy RO Membranes

Low energy RO membranes are designed to deliver high salt rejection and reliable permeate flow at lower operating pressures, helping reduce energy consumption and operating costs. Ideal for commercial and industrial RO systems treating mains water, bore water and low-to-moderate salinity feed water.

Available in 4040 and 8040 sizes for new RO systems and membrane replacement applications.

4 inch Low Pressure RO Membranes

Low Pressure LG RO Membrane BW 4040 ES
-13%

Low Pressure LG RO Membrane BW 4040 ES

LG BW 4040 ES, Low Pressure Reverse Osmosis Membrane 

 

 Permeate Flow GPD (m3/d) Stable Rejection Rate Operating pressure
2,500 (9.5) 99.5 % 150 psi (1,030 kpa)

 

* Test Conditions : 2,000 ppm NaCl at 25°C (77°F), 150 psi (10.3 bar), pH 7, Recovery 15%. 
* Each membrane element may have ±20% variation of permeate flow.
* Minimum salt rejection 99.2%
* Pre-treatment must be used to protect the membrane (softener, antiscalant dosing pump, sand filter, carbon filter, 5 mic cartridge fitler ...etc).

 

  • 4”x40” Low Pressure Brackish Water Membrane.
  • high permeability at low feed pressure.
  • Suitable for low to medium salinity brackish water.

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

It operates at Low Pressure (10.3 bar / 150 PSI) inlet feed water pressure.

LG BW 4040 ES Enery Saving BWRO membranes offer a combination of high rejection, high flow, low pressure feed water, reliability and durability,

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.   

All LG BWRO membranes provide superior performance along with intrinsic anti-fouling property and are suitable for applications where consistent and reliable performance is a must.     

Product Specifications:

Stabilized Salt Rejection: 99.5%*
Minimum Salt Rejection: 99.2%
Permeate Flow: 2500 gpd (9.5 m³/day)*
Membrane Area: 85 ft².
Diameter / Length: 4 inch / 40 inch.
*Test conditions: 2000 mg/l NaCl, 10.3 bar (150 psi), 25 °C (77 °F), pH 7, recovery rate 15%.
*Pre-treatment must be used to protect the membrane (softener, antiscalant dosing pump, sand filter, carbon filter, 5 mic cartridge fitler ...etc).   

Compatible with reverse osmosis membrane types:*

LG BW 4040 ES Membrane Element can be used as a replacement for the below membrane elements in your existing water treatment equipment.
FilmTec LC LE-4040 / Filmtec BW LE-4040 / GE Desal 4040 / Hydranautics ESPA2-LD-4040 / Toray TMG10D / CSM RE4040-BLN / Axeon HF1-4040.
*Check the data sheet for each membrane.   

Operation Conditions:

Max. working pressure:  600 psi (4.14MPa)
Max. Feed water flow:  16 gpm (3.6 m3/h)
Max. Temperature of Feed water:  45℃
Max. Feed water SDI (15 mins):  5.
Max. Feed Water Total Hardness: 10 ppm (softener or antiscalant should be used).
pH Range of Feed water during Continuous Operation:  2～11
pH Range of Feed Water during Chemical Cleaning:  2～12
Residual chlorine Concentration of feed water ＜0.1ppm Max.
Pressure drop of single membrane element:  15psi (0.1MPa)     

Commercial Application:

- Drinking water.
- Softened water for homes, hotels, commercial laundries and car wash.
- Spot free rinse for window cleaning and solar panel cleaning
- Pure water for pharmaceuticals, laboratories, Hemodialysis and electronics
- Sterilisers and autoclaves.
- Chemical industry.
- Aquarium water treatment.
- Boiler and cooling towers make-up water.
- Pure water, boiler water replenishment, foodstuff processing, and pharmaceutical production. 

Manufactured by: LG Chem, Korea. (assembled in china).

Download LG BW 4040 ES Technical Data Sheet
Regular price $419.00
Sale price $419.00 Regular price $485.00
Unit price
Trilite BWLE-4040 Low Pressure RO Membrane
-18%

Trilite BWLE-4040 Low Pressure RO Membrane

Commercial 4 inch x 40 inch Low Pressure Reverse Osmosis Membrane

 

 Permeate Flow GPD (m3/d) Stable Rejection Rate Operating pressure
2,600 (9.8) 99.5 % 150 psi (1,030 kpa)

 

* Test conditions: 1500 mg/l NaCl, 10.3 bar (150 psi), 25 °C (77 °F), pH 6.5-7.5, recovery rate 15%.
* Pre-treatment must be used to protect the membrane (softener, antiscalant dosing pump, sand filter, carbon filter, 5 mic cartridge fitler ...etc).
* Each membrane element may have ±20% variation of permeate flow rate.
* Minimum salt rejection 99.0%

Trilite BWLE-4040 commercial reverse osmosis membrane is suitable for water purification applications of water sources with salt concentration lower than 2000 ppm, such as surface water, underground water, tap water and municipal water.

Regular price $325.00
Sale price $325.00 Regular price $400.00
Unit price
Vontron ULP21-4040 RO Membrane
-8%

Vontron ULP21-4040 RO Membrane

Commercial 4 inch x 40 inch Low Pressure Reverse Osmosis Membrane

 

 Permeate Flow GPD (m3/d) Stable Rejection Rate Operating pressure
2,600 (9.8) 99.5 % 150 psi (1,030 kpa)

 

* Test conditions: 1500 mg/l NaCl, 10.3 bar (150 psi), 25 °C (77 °F), pH 7.5, recovery rate 8%.
* Pre-treatment must be used to protect the membrane (softener, antiscalant dosing pump, sand filter, carbon filter, 5 mic cartridge fitler ...etc).
* Each membrane element may have ±20% variation of permeate flow.
* Minimum salt rejection 99.0%

Vontron ULP 4040 commercial reverse osmosis membrane is suitable for water purification applications of water sources with salt concentration lower than 2000 ppm, such as surface water, underground water, tap water and municipal water.

Regular price $365.00
Sale price $365.00 Regular price $400.00
Unit price
Vontron ULP11-4040 Hi Flow Membrane
-8%

Vontron ULP11-4040 Hi Flow Membrane

Vontron ULP11-4040, 4 inch High Flow & Low Pressure Reverse Osmosis Membrane


 Permeate Flow GPD (m3/d) Stable Rejection Rate Operating pressure
2,700 (10.2) 98 % 150 psi (1,030 kpa)


* Test conditions: 1500 mg/l NaCl, 10.3 bar (150 psi), 25 °C (77 °F), pH 7.5, recovery rate 8%.
* Pre-treatment must be used to protect the membrane (softener, antiscalant dosing pump, sand filter, carbon filter, 5 mic cartridge fitler ...etc).
* Each membrane element may have ±20% variation of permeate flow.
* Minimum salt rejection 99.0%


4”x40” Hi Flow and Low Energy Membrane

2,700 gpd / 98% / 150 PSI

Recommended Where Hi Product Water Flow and Low Energy Consumption are needed


Regular price $365.00
Sale price $365.00 Regular price $400.00
Unit price
Vontron ULP31-4040 RO Membrane
-13%

Vontron ULP31-4040 RO Membrane

Vontron ULP31-4040 Low Pressure RO Membrane

 

 Permeate Flow GPD (m3/d) Stable Rejection Rate Operating pressure
1,900 (7.2) 99.4 % 150 psi (1,030 kpa)

 

* Test conditions: 1500 mg/l NaCl, 10.3 bar (150 psi), 25 °C (77 °F), pH 7.5, recovery rate 8%.
* Pre-treatment must be used to protect the membrane (softener, antiscalant dosing pump, sand filter, carbon filter, 5 mic cartridge fitler ...etc).
* Each membrane element may have ±20% variation of permeate flow.
* Minimum salt rejection 99.0%

Vontron ULP-31 4040 commercial reverse osmosis membrane is suitable for water purification applications of water sources with salt concentration lower than 2000 ppm, such as surface water, underground water, tap water and municipal water.

Regular price $345.00
Sale price $345.00 Regular price $400.00
Unit price
Vontron ULP21-4021 Reverse Osmosis Membrane
-23%

Vontron ULP21-4021 Reverse Osmosis Membrane

Vontron ULP21-4021, 4 inch x 21 inch Low Pressure Reverse Osmosis Membrane

4”x21” Low Energy RO Membrane.

950 gpd / 99% / 150 PSI.

Typical operating pressure of 150PSI (1050kPa).

 

Vontron ULP21-4021 ultra low pressure membrane delivers high permeate flows and salt rejection at lower raw water pressures, compared to regular low-pressure membrane elements. The high salt rejection and low working pressure result in up to 30% lower energy consumption compared to standard elements.

Regular price $269.00
Sale price $269.00 Regular price $350.00
Unit price
-4%

CSM RE4040-BLN RO Membrane

CSM RE4040-BLN Low Pressure RO Membrane


High-Performance Low Pressure 4" × 40" Reverse Osmosis Membrane

CSM RE4040-BLN is a high flow, low-pressure reverse osmosis membrane designed for commercial and industrial water purification applications. 

Manufactured by Toray Advanced Materials Korea under the CSM membrane brand, this 4 inch RO membrane delivers excellent salt rejection and high permeate flow while operating at lower pressures to help reduce energy consumption.


Specifications

Parameter

CSM RE4040-BLN

Permeate flow

2,600 GPD (9.8 m³/day)

Nominal salt rejection

99.4%

Minimum salt rejection

99.3%

Membrane area

85 ft² (7.9 m²)

Test pressure

150 psi (10.3 bar)

Test salinity

1,500 ppm NaCl
Maximum feed water TDS 3,000 ppm NaCl

Maximum temperature

45°C

Certification

NSF/ANSI/CAN 61

  • Permeate flow and rejection ratings are based on manufacturer test conditions. Actual performance varies with feed-water quality, operating pressure, temperature and recovery rate.

  • Pre-treatment must be used to protect the membrane (softener, antiscalant dosing pump, sand filter, carbon filter, 5 mic cartridge fitler ...etc).


About CSM

  • CSM is a leading membrane brand manufactured by Toray Advanced Materials Korea, with decades of experience in membrane technology since 1994.

  • CSM specialises in high-performance Reverse Osmosis (RO), Nanofiltration (NF) and Ultrafiltration (UF) membranes for residential, commercial and industrial water treatment applications.

  • Known for their quality, reliability and advanced technology, CSM membranes are widely used in water purification, seawater desalination, ultrapure water production and wastewater recycling worldwide.


Features and Benefits

  • Low Pressure Operation: Designed to operate efficiently at lower feed pressures, reducing energy requirements.

  • High Permeate Flow: Produces up to 2,600 GPD (9.8 m³/day) under standard test conditions.

  • Excellent Salt Rejection: Nominal 99.4% NaCl rejection for reliable water purification.

  • Energy Efficient: Helps reduce operating costs compared with conventional higher-pressure RO membranes.

  • Standard 4040 Size: Suitable for compatible 4" x 40" commercial and industrial RO membrane housings.

  • Reliable Performance: Designed for consistent water quality and efficient operation..

  • Manufactured by Toray Advanced Materials Korea – CSM reverse osmosis membrane technology.
  • NSF/ANSI/CAN 61 certification – as indicated in the manufacturer’s product literature.


Typical Applications

The CSM RE4040-BLN membrane is suitable for a variety of water treatment applications, including:

  • Drinking water.

  • Commercial reverse osmosis water purification systems

  • Industrial process water treatment

  • Brackish groundwater desalination

  • Boiler feed-water pretreatment

  • Water treatment for manufacturing facilities

  • Food and beverage process-water preparation

  • Water purification for agricultural and irrigation applications

  • Replacement membranes for compatible 4040 RO systems

  • Pure water for pharmaceuticals, laboratories, Hemodialysis and electronics


Operating Limits – CSM RE4040-BLN

Parameter

Operating Limit

Maximum Pressure Drop per Element

15 psi (0.10 MPa)

Maximum Pressure Drop per 240" Vessel

60 psi (0.41 MPa)

Maximum Operating Pressure

600 psi (4.14 MPa)

Maximum Feed Flow Rate

18 GPM (4.09 m³/h)

Minimum Concentrate Flow Rate

4 GPM (0.91 m³/h)

Maximum Operating Temperature

45°C (113°F)

Operating pH Range

2.0–11.0

CIP Cleaning pH Range

1.0–13.0

Maximum Feed Water Turbidity

1.0 NTU

Maximum SDI (15 minutes)

5.0

Maximum Free Chlorine Concentration

<0.1 mg/L


Download CSM RE4040-BLN Data Sheet


Alternative 4040 Reverse Osmosis Membranes

The CSM RE4040-BLN is a high-rejection, 4" × 40" brackish water reverse osmosis membrane.

Depending on the existing RO system design and operating conditions, it is considered as an alternative to:

  • DuPont (DOW): FilmTec XLE-4040 / XLE PRO-4040

  • Hydranautics: ESPA Series, ESPA1-LD-4040, ESPA2-LD-4040, ESPA4-LD-4040

  • Toray: TMG10D

  • LG BW 4040 ES

  • GE Osmonics / SUEZ: SUEZ AG-85 P LE 4040 (formerly LewaBrane B085 LE 4040), SUEZ AG4040C

  • Vontron ULP21-4040

Important: These models are potential alternatives. Permeate flow, salt rejection, operating pressure and physical connections may differ. Please check the manufacturer's datasheets and confirm compatibility before ordering.

MDC Water can assist with membrane selection and replacement compatibility for commercial and industrial RO systems.


Regular price $480.00
Sale price $480.00 Regular price $500.00
Unit price

4 inch Extra Low Pressure RO Membranes

Vontron XLP11-4040 Extremely Low Pressure Membrane
-8%

Vontron XLP11-4040 Extremely Low Pressure Membrane

Vontron XLP11-4040, 4 inch x 40 inch Extremely Low Pressure Reverse Osmosis Membrane

4”x40” Extremely Low Pressure Membrane

2,000 gpd / 98% / 100 PSI

Designed for Low Salinity Inlet Water to Operate at Ultra Low Pressure (6.9 bar / 100 PSI)

Regular price $365.00
Sale price $365.00 Regular price $400.00
Unit price
TRILITE BWULE-4040 Ultra Low Pressure RO Membrane
-18%

TRILITE BWULE-4040 Ultra Low Pressure RO Membrane

TRILITE BWULE-4040, Ultra Low Pressure Reverse Osmosis Membrane

 

  • Low operating pressure (approximately half of standard RO membranes)
  • Reduced energy consumption
  • Lower initial system cost (smaller pumps, piping, valves, and related equipment)
  • Suitable for feed water with TDS < 1,000 ppm
  • Applications: Drinking water, low-salinity industrial water, food and pharmaceutical industries

 

 Permeate Flow GPD (m3/d) Stable Rejection Rate Operating pressure
2,600 (9.8) 99.2 % 100 psi (690 kpa)

 

Test Conditions: 

  1.  Operating Pressure 100psi (0.69Mpa / 7.03kgf/cm2)
  2. Temperature 25℃ (77℉)
  3. Tested at 500mg/L NaCl Solution.
  4. pH 6.5~7.5 5.
  5. Recovery Rate at 15%. 
  6. Each membrane element may have ±20% variation of permeate flow rate

* Pre-treatment must be used to protect the membrane (softener, antiscalant dosing pump, sand filter, carbon filter, 5 mic cartridge fitler ...etc).

Designed for Low Salinity Inlet Water to Operate at Ultra Low Pressure (6.9 bar / 100 PSI)

 

Regular price $325.00
Sale price $325.00 Regular price $400.00
Unit price

2.5 inch Low Pressure Reverse Osmosis Membranes

Vontron ULP21-2521 RO Membrane
-15%

Vontron ULP21-2521 RO Membrane

2.5 inch x 21 inch 2521 Low Pressure Reverse Osmosis Membrane

2.5”x21” 2521 Low Pressure Membrane

300 gpd / 99% / 150 PSI

Typical operating pressure of 150PSI (1050kPa)

Regular price $295.00
Sale price $295.00 Regular price $350.00
Unit price
Vontron ULP21-2540 RO Membrane
-18%

Vontron ULP21-2540 RO Membrane

2.5 inch x 40 inch Low Pressure Reverse Osmosis Membrane

2.5”x40” 2540 Low Pressure Membrane

750 gpd / 99% / 150 PSI

Typical operating pressure of 150PSI (1050kPa)

Regular price $325.00
Sale price $325.00 Regular price $400.00
Unit price

8 inch Low Pressure Reverse Osmosis Membranes

-18%

VONTRON ULP22-8040 RO Membrane

ULP22-8040 High Flow and Low Pressure RO Membrane, Industrial 8 inch Reverse Osmosis Membrane

  • Industrial High Flow Low Pressure RO Membrane.
  • 12,100 gpd / 99% / 150 PSI (1,030 kPa).
  • Offers a combination of high flow production and low working pressure.
  • Suitable for meduim salinity brackish water.
Regular price $980.00
Sale price $980.00 Regular price $1,200.00
Unit price
-31%

Lewabrane RO B400 ULP ASD

8”x40” Ultra Low Pressure & Reduced Fouling Tendency 8040 Membrane

8”x40” Ultra Low Pressure & Reduced Fouling Tendency Membrane

10,200 gpd / 99.5% / 110 PSI (760 kPa)

Designed for Low Salinity Inlet Water to Operate at Ultra Low Pressure (7.6 bar / 110 PSI)

Regular price $1,095.00
Sale price $1,095.00 Regular price $1,600.00
Unit price

FAQs

FAQs