Brackish Water RO Membranes

MDC Water stocks brackish water reverse osmosis membranes for commercial and industrial RO plants treating feed water from 500 to 10,000 ppm TDS. Standard 4040 and 8040 element sizes are held as Australian stock for direct replacement, with 1812 elements available for small-commercial duty. Supplier since 1998.

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Commercial 4040 High Salt Rejection Reverse Osmosis Membrane

Permeate Flow GPD (m³/d)	Stable Rejection Rate	Operating pressure
2,800 (9.8)	99.6 %	225 psi (1,550 kpa)

Test Conditions:

Operating Pressure 225psi (1.55Mpa / 15.8kgf/cm2)
Temperature 25℃ (77℉)
Tested at 2,000mg/L NaCl Solution.
pH 6.5~7.5.
Recovery Rate at 15%.
Each membrane element may have ±15% 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).

• 4”x40” 4040 Brackish Water RO Membrane.

• Provides high permeate flow and high salt rejection at hi salinity inlet water.

• High Performance in Rejecting Salts, TOC, SiO2

• Suitable for Treatment of Water with TDS up to 8,000ppm (NaCl solution)

• Trilite BWHR-4040 commercial reverse osmosis membrane is suitable for water purification applications of water sources with salt concentration lower than 8000 ppm, such as surface water, underground water, tap water and municipal water.

Trilite BWLE-4040 Low Energy RO 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.

Product Specifications:

Membrane Area: 100 ft² (9.3m²).
Diameter / Length: 4 inch / 40 inch.
Feed Spacer Thickness: 28 (mil)

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.

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 SDI15: 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: 1～13
Residual chlorine Concentration of feed water ＜0.1ppm Max.
Pressure drop of single membrane element: 15psi (0.1MPa)

Download Trilite BWHR-4040 Data Sheet

Replaces: Vontron ULP21-4040, LG BW 4040 R

Manufactured by: Samyang (Korea), Made in China

Compatible with reverse osmosis membrane types:

The Trilite BWLE-4040 membrane element can be used as a replacement for the following membrane elements in existing water treatment systems:

Filmtec BW30-4040 / Vontron LP21-4040 / GE Desal AG4040 / Hydranautics CPA2-4040 / Toray TM710 / CSM RE4040-BE.

*Please refer to the datasheet for each membrane for compatibility confirmation.

$325.00

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Brackish TDS Range & Membrane Match

Brackish water reverse osmosis membranes are matched to feed-water TDS classification: low brackish runs 500 to 2,000 ppm, moderate brackish 2,000 to 10,000 ppm, and high brackish 10,000 to 15,000 ppm. Standard BW elements cover the low and moderate ranges and are the default specification for most Australian commercial and industrial sites on town water, bore water or moderately saline source water. High-brackish feed approaching 15,000 ppm requires either a high-rejection BW variant or a transition to seawater membrane chemistry. Match the membrane class to feed TDS before specifying element size.

Standard 4040 and 8040 Element Sizes

MDC Water stocks brackish water RO membranes in standard 4040 and 8040 element sizes — the commercial and industrial workhorses. The 4040 element is 4 inches in diameter and 40 inches long, suiting mid-size commercial RO plants and OEM modular skids. The 8040 element is 8 inches in diameter and 40 inches long, used in larger commercial and industrial RO trains across food and beverage, manufacturing, mining and municipal applications. Smaller 1812 BW elements are available for residential and light-commercial RO systems. Element diameter must match vessel diameter — sizes are not cross-fit.

Salt Rejection & Operating Pressure

Standard brackish water RO membranes deliver 99%+ salt rejection at typical design conditions of 1,000 to 1,500 kPa operating pressure. Rejection is measured at standard test conditions — actual field rejection depends on feed TDS, recovery rate, temperature and pre-treatment. Operating pressure for BW elements runs lower than seawater membranes because feed osmotic pressure is lower at brackish TDS. Recovery on BW systems typically runs 50 to 75% depending on feed chemistry and anti-scalant use.

FAQs

Filmtec BW30-4040 Brackish Water RO Membrane image 0

FAQs

01. What is brackish water?

Brackish water is feed water with total dissolved solids between 500 and 30,000 ppm — saltier than fresh water but less saline than seawater. The classification splits further: low brackish (500–2,000 ppm), moderate brackish (2,000–10,000 ppm) and high brackish (10,000–15,000 ppm). Most Australian commercial RO sites run on low or moderate brackish feed from town or bore water sources.

02. What TDS range do brackish RO membranes handle?

Standard brackish water RO membranes handle feed water up to roughly 10,000 ppm TDS, with high-rejection variants extending coverage to 15,000 ppm. Above 15,000 ppm, seawater RO membrane chemistry becomes the appropriate choice because operating pressure and osmotic load rise beyond BW design conditions. Match the membrane class to actual feed TDS rather than a worst-case assumption — over-specifying SW for a brackish site adds energy cost without performance benefit.

03. What is the salt rejection rate of a BW RO membrane?

Standard brackish water RO membranes are rated for 99%+ salt rejection at design conditions. Actual rejection varies by feed TDS, recovery rate, temperature and membrane age. New BW membranes on well-pre-treated feed routinely deliver 99.5% rejection. As membranes age, salt passage rises gradually — replacement is triggered when rejection drops below the system's design specification rather than at a fixed time.

04. What sizes do brackish RO membranes come in?

Brackish water RO membranes come in 1812, 4040 and 8040 standard sizes. The 1812 is for residential and light commercial. The 4040 covers mid-size commercial and small industrial. The 8040 is the industrial standard used in larger commercial RO plants and high-flow industrial trains. Element size codes are diameter (inches) followed by length (inches), so a 4040 is 4" diameter × 40" long.

05. Are MDC Water brackish RO membranes interchangeable with other brands?

Brackish water RO membranes of matching size code are interchangeable across major OEM brands — a 4040 BW element from MDC Water fits any vessel rated for a 4040 element. The same applies to 1812 and 8040 sizes. Brand-specific OEM elements have no physical advantage over equivalently rated BW elements from MDC Water, and replacement does not require sourcing from the original system manufacturer.

Brackish Water RO Membranes

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