LG RO Membranes Australia
NanoH2O RO Membranes Australia
LG Reverse Osmosis-Membranes Australia
LG BW 4040 R Brackish RO Membrane, size guide
LG BW 4040 R Brackish RO Membrane, dimension drawing
LG RO Membranes Australia
NanoH2O RO Membranes Australia
LG Reverse Osmosis-Membranes Australia
LG BW 4040 R Brackish RO Membrane, size guide
LG BW 4040 R Brackish RO Membrane, dimension drawing
LG RO Membranes Australia
NanoH2O RO Membranes Australia
LG Reverse Osmosis-Membranes Australia
LG BW 4040 R Brackish RO Membrane, size guide
LG BW 4040 R Brackish RO Membrane, dimension drawing

Datasheet by NanoH2O Co., Ltd., v260930. Earlier datasheets list this model as LG BW 4040 R.

LG BW 4040 R Brackish RO Membrane

4 x 40 inch

LG BW 4040 R is a 4040 brackish RO element (nominal 4 x 40 in). Rated by NanoH2O at 2,000 ppm NaCl, 225 psi (15.5 bar), 25 C, pH 7, 15% recovery: 2,500 gpd (9.5 m3/d); salt rejection 99.6% stabilised, 99.3% minimum. LG BW 4040 R datasheet (NanoH2O), v260930

Size code
4040 nominal 4 x 40 in
Rated permeate flow
2,500 gpd (9.5 m3/d)
Salt rejection
99.6% stabilised, 99.3% minimum
Operating pressure
225 psi (1.55 MPa)
Regular price $419.00
Sale price $419.00 Regular price $485.00
Unit price
Tax included.

Tax invoice on every order.

In stock. In-stock items dispatch next business day.
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  • Freight to remote sites Australia-wide.
  • Freight calculated at checkout. Large or remote orders quoted.
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LG RO Membranes Australia

LG BW 4040 R Brackish RO Membrane, 4 x 40 inch

Regular price $419.00
Sale price $419.00 Regular price $485.00
Unit price

Specifications

Figures last checked 3 Nov 2026.
Size
Maker, modelNanoH2O Co., Ltd., BW 4040 R. Earlier datasheets list this model as LG BW 4040 R.
Size code4040, nominal 4 x 40 inGradeBrackish
Element length1,016 mm (40 in)Outside diameter100 mm (3.9 in)
Weight (wet)4.0 kg (8.8 lb)Active area85 ft2 (7.9 m2)
Performance
Rated permeate flow2,500 gpd (9.5 m3/d), flow plus or minus 20%
Salt rejection99.6% stabilised, 99.3% minimum
Test conditions2,000 ppm NaCl, 225 psi (15.5 bar), 25 C, pH 7, 15% recovery
Operating pressure225 psi (1.55 MPa)
Limits
Max operating pressure600 psi (41.3 bar)Max feed temperature45 C
pH, continuous2 to 11pH, cleaning2 to 12
Max feed SDI5.0Feed spacer28 mil
Other models NanoH2O compares

Replacing the vessel too?

Per FilmTec's datasheets, 4040 elements are made for a nominal 4 inch vessel (CSM's RE4040 datasheets say the same for the 4040). Check the vessel's design pressure against your system before you order. Already have a vessel? Skip this.

See all 4040 vessels
ImageVesselFor elementsDesign pressurePriceAction
FRP Membrane Pressure Vessel, 4040 (4 x 40 in), Max Pressure 300 psiFRP Size4040 Design pressure300 psi (2.1 MPa) $339.00In stock
Seawater RO Membrane Pressure Vessel, 4040 (4 x 40 in), Max Pressure 1,000 psiFRP Size4040 Design pressure1,000 psi (7.0 MPa) $980.00In stock

About this model

NanoH2O rates this brackish element at 2,000 ppm NaCl, 225 psi (15.5 bar), 25 C, pH 7, 15% recovery. On the maker sheets we hold, seawater elements are rated at 800 psi, brackish at 225 psi and low pressure at 100 to 150 psi, so compare like with like.

Check the code on your old element first: a 4021 is 21 inches long and a 4040 is 40 inches long, so they do not interchange.

Frequently asked questions

What does 4040 mean on this membrane?

4040 is the size code: a nominal 4 inch element, 40 inches long. The first two digits are the nominal diameter in tenths of an inch and the last two are the length in inches. This element's datasheet gives length 1,016 mm (40 in) and outside diameter 100 mm (3.9 in).

Which vessel size does a 4040 element go in?

Per FilmTec's datasheets, 4040 elements are made for a nominal 4 inch vessel (CSM's RE4040 datasheets say the same for the 4040). Matching vessels are under 'Replacing the vessel too?' on this page.

What are the rated flow and salt rejection, and under what conditions?

NanoH2O rates it at 2,000 ppm NaCl, 225 psi (15.5 bar), 25 C, pH 7, 15% recovery: 2,500 gpd (9.5 m3/d); flow plus or minus 20%. Salt rejection: 99.6% stabilised, 99.3% minimum. These are the maker's ratings at its test conditions; see the LG BW 4040 R datasheet (NanoH2O), v260930.

What changed from LG to NanoH2O?

The current datasheet (v260930) is issued by NanoH2O Co., Ltd. Earlier datasheets list this model as LG BW 4040 R. We sell it under its stored name.

Which other makers' models does NanoH2O rate as comparable?

NanoH2O's Product Comparison Tool (checked 3 Nov 2026) names the BW 4040 R for 13 other makers' models. Each one is listed on this page as its own line under 'Other models NanoH2O compares', with a link to the tool. Figures differ by model, see each datasheet.

Is it in stock, and when does it dispatch?

Stock shows live beside the price. In-stock items dispatch next business day. Freight to remote sites Australia-wide, and a tax invoice comes with every order.

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