Best Commercial RO Membrane
Filtration accuracy: 0.0001 micron
Service life: 1-2 years
Salt rejection rate: 99.5%
PH range: 2-11
Maximum water inlet temperature: 45°C
A Commercial RO Membrane is a type of filtration device used in water treatment processes to separate impurities from water using the principle of reverse osmosis. Reverse osmosis involves applying pressure to force water through a semipermeable membrane that allows water molecules to pass while blocking larger molecules, contaminants, and impurities, including dissolved salts, heavy metals, bacteria, and other pollutants.
There are many types of RO membranes on the market, and customers often encounter the problem of not knowing which RO membrane to choose when choosing. There are unified rules for setting the models of RO membranes worldwide.
Reverse Osmosis RO Membrane Naming Rule
For example: HM-BW-8040
The green part is the brand name of the RO membrane.
- HM means the RO membrane is manufactured in China.
The yellow part is the membrane element series.
- XLP: Extremely low-pressure membrane element series
- ULP: Ultra low-pressure membrane element series
- BW: Brackish membrane element series
- FR: Fouling-resistant membrane element series
- SW: Sea water desalination membrane element series
- NF: Nano filtration membrane element series
The red part is the diameter of the membrane element, inches(''), (Data*0.1)
- 25: Diameter of the 2.5'' membrane element
- 40: Diameter of the 4.0'' membrane element
- 80: Diameter of the 8.0'' membrane element
The blue part is the length of the membrane element, inches('')
- 21: Length of the 21'' membrane element
- 40: Length of the 40'' membrane element
- 80: Length of the 80'' membrane element
Best Commercial RO Membrane Selection Guide
Detailed specifications of each series of RO membranes
XLP Series Membrane Elements
The desalination rate can reach 98%. Suitable for desalting those water sources with low salinity while not requiring high salt rejection, with salt concentration lower than 1000 ppm.
| Model | Active Membrane ft2(m2) |
Average Permeate GPD(m3/d) |
Stable Rejection(%) | Min. Rejection(%) |
| XLP-2521 | 16(1.5) | 450(1.7) | 98.0 | 97.5 |
| XLP-2540 | 33(3.0) | 900(3.4) | ||
| XLP-4021 | 42(3.9) | 1,300(4.9) | ||
| XLP-4040 | 85(7.9) | 2,600(9.8) | ||
| XLP-8040 | 400(37.2) | 12,000(45.4) | ||
| XLP-8040-440 | 440(40.9) | 13,200(49.9) |
Testing conditions:
Testing Pressure: 100 psi (0.69MPa)
Temperature of Testing Solution: 25 ℃
Concentration of Testing Solution (NaCl): 500ppm
pH Value of Testing Solution: 7.5
Recovery Rate of Single Element: 15%
ULP Series Membrane Elements
The desalination rate can reach 99.3%. Suitable for desalting those water sources with salt concentrations lower than 2000 ppm, such as surface water, underground water, tap water municipal water, etc.
| Model | Active Membrane ft2(m2) |
Average Permeate GPD(m3/d) |
Stable Rejection(%) | Min. Rejection(%) |
| ULP-2521 | 16(1.5) | 400(1.5) | 99.5 | 99.3 |
| ULP-2540 | 33(3.0) | 800(3.0) | 99.5 | 99.3 |
| ULP-4021 | 42(3.9) | 1,100(4.2) | 99.5 | 99.3 |
| ULP1-4040 | 85(7.9) | 3,100(11.7) | 99.0 | 98.5 |
| ULP2-4040 | 85(7.9) | 2,700(10.2) | 99.3 | 99.0 |
| ULP3-4040 | 85(7.9) | 2,200(8.3) | 99.5 | 99.3 |
| ULP1-8040 | 400(37.2) | 14,000(53) | 99.0 | 98.5 |
| ULP2-8040 | 400(37.2) | 12,000(45.4) | 99.3 | 99.0 |
| ULP3-8040 | 400(37.2) | 10,500(39.7) | 99.5 | 99.3 |
| ULP3-8040-440 | 440(40.9) | 12,000(45.4) | 99.5 | 99.3 |
Testing conditions:
Testing Pressure: 150 psi (1.03MPa)
Temperature of Testing Solution: 25 ℃
Concentration of Testing Solution (NaCl): 1500ppm
pH Value of Testing Solution: 7.5
Recovery Rate of Single Element: 15%
BW & FR Series Membrane Elements
BW series is an aromatic polyamide composite membrane element for the desalination of brackish water. It has the characteristics of high water production and good desalination performance. In addition, it has high performance in removing soluble salts, TOC, and SiO2, and is especially suitable for the making of high purified water in the electronics and power industries. It is suitable for desalination treatment of surface water, groundwater, tap water, and municipal water with a salt content of less than 5,000 ppm. It is mainly used for industrial pure water of various scales, boiler feed water of power plants, and other industrial water. It can also be used for the treatment of brackish water applications such as high-concentration saline waste water and beverage water manufacturing.
FR series, the surface of this membrane was treated by special technology, which changed the electric charge and smoothness of the membrane surface, increasing the hydrophilicity of the membrane surface, thus reducing the contamination of pollutants and microorganisms on the membrane surface, and achieving the purpose of reducing the contamination of membrane components and prolonging the service life.
| Model | Active Membrane ft2(m2) |
Average Permeate GPD(m3/d) |
Stable Rejection(%) | Min. Rejection(%) |
| BW-2521 | 16(1.5) | 400(1.5) | 99.7 | 99.5 |
| BW-2540 | 33(3.0) | 800(3.0) | ||
| BW-4021 | 42(3.9) | 1,100(4.2) | ||
| BW-4040 | 85(7.9) | 2,400(9.1) | ||
| BW-8040 | 400(37.2) | 10,500(39.7) | ||
| BW-8040-440 | 440(40.9) | 12,000(45.4) | ||
| FR-4040 | 400(37.2) | 2,400(9.1) | ||
| FR-8040 | 440(40.9) | 10,500(39.7) |
Testing conditions:
Testing Pressure: 225 psi (1.5MPa)
Temperature of Testing Solution: 25 ℃
Concentration of Testing Solution (NaCl): 2000ppm
pH Value of Testing Solution: 7.5
Recovery Rate of Single Element: 15%
SW Series Membrane Elements
Applicable to the treatment of seawater and high- high-concentration brackish water
| Model | Active Membrane ft2(m2) |
Average Permeate GPD(m3/d) |
Stable Rejection(%) | Min. Rejection(%) |
| SW-2521 | 16(1.5) | 270(1.0) | 99.8 | 99.5 |
| SW-2540 | 33(3.0) | 600(2.3) | ||
| SW-4021 | 42(3.9) | 750(2.8) | ||
| SW-4040 | 85(7.9) | 1,600(6.1) | ||
| SW-8040 | 400(37.2) | 7,500(28.4) | ||
| SW-8040-440 | 440(40.9) | 8,250(31.2) |
Testing conditions:
Testing Pressure: 800 psi (5.5MPa)
Temperature of Testing Solution: 25 ℃
Concentration of Testing Solution (NaCl): 32000ppm
pH Value of Testing Solution: 7.5
Recovery Rate of Single Element: 8%
Membrane elements Operational Limits and Conditions (for all series):
- Max.Working Pressure: 600psi(4.14MPa)
- Max.Feed Water Flow: 75gpm(17 m3/h) for 8040; 16gpm(3.6 m3/h) for 4040,4021; 6.0gpm(1.4 m3/h) for 2521,2540
- Max.Feed Water Temperature: 45℃
- Max.Mn: 0.1mg/L
- Max.Fe: 0.05mg/L
- Max.Turbidity NTU: 1.0
- Max. Feed Water SDI15: 5
- Max. Feed Water COD: 15ppm
- Max. Feed Water BOD: 10ppm
- Max. Feed Water TOC: 3ppm
- Residual Chlorine Concentration of Feed Water: <0.1ppm
- pH Range of Feed Water During Continuous Operation: 3~10
- Max.Pressure Drop of Single Element: 15psi(0.1MPa) for 8040,4040,2540; 10psi(0.07MPa) for 2521,4021
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