4 Inch Reverse Osmosis Membranes
- We supply 4 inch membranes in a wide variety of types to suit most applications including brackish water, seawater, low pressure and ultra low pressure RO membranes. 4040 4×40 RO membranes and 4021 4×21 reverse osmosis membranes.
- 4″ commercial RO membrane elements produce high quality water from tap, brackish water or seawater.
- 4 inch industrial reverse osmosis membrane acts as a barrier to all salts and inorganic molecules, as well as organic molecules.
4 Inch Brackish Water Reverse Osmosis Membranes
Our brackish water 4040 4×40 inch RO Membranes provide high product water flows and salt rejection at high salinity inlet water (up to 8,000 ppm NaCl Salinity).
Brackish water RO Membranes are the best balance of flow and salt rejection.
Working pressure between 200 and 260 PSI (13.7 – 18 bar).
FREE Delivery
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FilmTec BW30 PRO-4040 – 4″ x 40″ Brackish Water Membrane
$520.00- Fouling resistant RO membrane.
- High Rejection and High Performance Brackish Water RO Membrane.
- Flow 2,600 gpd / Salt Rej 99.7% / Pressure 225 PSI.
- Suitable for high salinity brackish water.
- FREE Delivery (regional areas excluded)*
- Sale!
Filmtec BW30-4040 Brackish Water RO Membrane
$495.00- 4”x40” Durable Brackish Water Membrane.
- 2400 gpd / 99.5% / 225 PSI.
- Provides consistent and outstanding system performance.
- Suitable for high salinity brackish water.
- FREE Delivery (regional areas excluded)*
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Revese Osmosis Membrane Vontron LP21-4040
$365.004”x40” 4040 Brackish Water RO Membrane Flow 2400 gpd / Salt Rejection 99.5% / Pressure 225 PSI Provides high permeate flow and high salt rejection at hi salinity inlet water Equivalent to Filmtec BW30-4040 FREE Delivery (regional areas excluded)* - Sale!
LG RO Membrane – BW 4040 R
$419.00- 4”x40” Hi Rejection Brackish Water Membrane.
- 2500 gpd / 99.6% / 225 PSI.
- Offers a combination of high rejection and reliability.
- Suitable for high salinity brackish water.
- FREE Delivery (regional areas excluded)*
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Hydranautics CPA5-LD-4040 Reverse Osmosis Membrane
$455.00- 4”x40” Hi Rejection Brackish Water Membrane.
- 2100 gpd / 99.7% / 225 PSI.
- Offers a combination of high rejection and reliability.
- Suitable for high salinity brackish water.
- FREE Delivery (regional areas excluded)*
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Suez AG-85 P FR 4040 Membrane
Previously Lewabrane RO B085 FR 4040 4”x40” Low Fouling Brackish Water RO Membrane 2,400 gpd / 99.5% / 225 PSI Provides the highest productivity and high salt rejection at hi salinity inlet water., Designed for water with a higher organic or biological fouling rate
Low Pressure Reverse Osmosis 4 Inch Membranes
4″ Low Energy (LE type) and Low Pressure (LP) membrane elements are recommended for low-moderate salinity applications or/and in applications where low energy consumption is an important consideration.
Low pressure LP or ultra low pressure ULP membrane elements are based on 150 PSI (10.3 bar) test working pressure, please check each membrane details below
Size: 4×40 and 4/21 inch RO membranes.
4 inch Ultra Low Pressure Reverse Osmosis Membranes (4″ Extreme Low Pressure)
They are designed for low salinity water to operate at ultra low pressure (ULP). The high permeability results in up to 40% lower energy consumption compared to standard elements.
These membrane elements are based around 100-110 PSI (around 7 bar) test working pressure, please check each membrane details below
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Suez AG-85 P LE Low Pressure 4040 Membrane
$520.00Previously Lewabrane B085 LE 4040 4”x40” Low Pressure Membrane 2,000 gpd / 99.5% / 150 PSI Recommended where low energy consumption is an important consideration FREE Delivery (regional areas excluded)* - Sale!
Vontron ULP11-4040 Hi Flo
$365.004”x40” Hi Flow and Low Pressure Membrane 2,700 gpd / 98% / 150 PSI Recommended Where Hi Product Water Flow and Low Energy Consumption are needed FREE Delivery (regional areas excluded)* - Sale!
Vontron XLP11-4040
$365.004”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) FREE Delivery (regional areas excluded)* - Sale!
Vontron ULP21-4040 RO Membrane
$365.004”x40” 4040 Low Pressure Membrane 2400 gpd / 99% / 150 PSI Typical operating pressure of 150PSI (1050kPa) Will be available early February 2022 FREE Delivery (regional areas excluded)* - Sale!
LG RO Membrane BW 4040 ES
$419.00- 4”x40” Low Pressure Brackish Water Membrane.
- 2500 gpd / 99.5% / 150 PSI.
- high permeability at low feed pressure.
- Suitable for low to medium salinity brackish water.
- FREE Delivery (regional areas excluded)*
- Sale!
Vontron ULP21-4021 Reverse Osmosis Membrane
$269.004”x21” Low Pressure RO Membrane 950 gpd / 99% / 150 PSI Typical operating pressure of 150PSI (1050kPa) - Sale!
FilmTec XLE PRO-4040 – 4″ x 40″ Low Pressure Membrane
$595.00- Extra Low Energy Tape-Wrapped Membrane.
- High flux (productivity) results in high yields.
- Flow 2,750 gpd / Salt Rej 99% / Pressure 125 PSI.
- FREE Delivery (regional areas excluded)*
Seawater Desalination 4 Inch RO Membranes
- Used for Seawater desalination systems.
- Marine and Maritime watermakers.
- Yacht and boat desalination units.
4″ RO Membrane Housings
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4″x40″ 4040 Membrane Pressure Vessel
$339.00300 PSI Membrane Housing For 4"x40" 4040 Membranes FREE Delivery (regional areas excluded)* - Sale!
4040 Seawater Membrane Housing 4″x40″
$790.001000 PSI Membrane Housing For Watermakers & Seawater Desalination Delivery excluded - Sale!
4″x40″ Stainless Steel RO Membrane Housing
$235.00300 PSI End Clamp Membrane Pressure Vessel for 4″ x 40″ Membranes FREE Delivery (regional areas excluded)* - Sale!
4″x21″ Stainless Steel RO Membrane Housing
$190.00300 PSI End Clamp Membrane Pressure Vessel for 4″ x 21″ Membranes - Sale!
4″x21″ 4021 FRP Membrane Pressure Vessel
$295.00300 PSI Fiberglass Membrane Housing For 4"x21" 4021 Membranes
Competitive Reverse Osmosis Membranes Comparison Guide
Dow Filmtec / GE Desal / Hydranautics / Tory / CSM
| Lanxess | Dow Filmtec | GE Desal | Hydranautics | Toray | CSM |
| Lewabrane B085 HF 4040 | Dow Filmetc BW30-4040 | GE Desal AG4040FF | Hydranautics CPA2-4040 | Toray TM710 | CSM RE4040-BE |
| Lewabrane B085 LE 4040 | Dow Filmetc LE-4040 | Hydranautics ESPA2-LD-4040 | CSM RE4040-BLN | ||
| Lewabrane B085 FR 4040 | Hydranautics LFC3-LD-4040 | Toray TML10D | |||
| Lewabrane S085 HR 4040 | Dow Filmetc SW30-4040 | GE Desal SE4040FF | Hydranautics SWC1-4040 | Toray TM-810L | CSM RE4040-SHA |
| Lewabrane B400 HF | Dow Filmetc BW30-400 | GE Desal AG8040F400 | Hydranautics CPA3 | Toray TM720-400 | CSM RE8040-BE |
| Lewabrane B400 HR | Dow Filmetc BW30-400 | Hydranautics CPA5-LD | |||
| Lewabrane B400 FR | Dow Filmetc BW30-400FR | Hydranautics LFC3-LD-8040 | Toray TML20D-400 | CSM RE8040-FEn34 | |
| Lewabrane B400 LE | Dow Filmetc LE-400 | GE Desal AK8040F | Hydranautics ESPA | Toray TM820H-370 | CSM RE8040-BL |
| Lewabrane S400 HR | Dow Filmetc SW30HRLE–400 | Hydranautics SWC3 | Toray TM820H-400 | CSM RE8040-SH | |
| Lanxess | Dow Filmtec | GE / Desal | Hydranautics | Toray | CSM |
PS: this chart is a general guide only, please email us to source membranes for you or offer an alternative that is currently stocked