Product Description
Puri-guard® BW-4040 reverse osmosis membrane is a type of water filtration membrane used in systems that remove rate of dissolved salts, TOC, SiO2 and other substances, and is especially suitable for the preparation of high purity water in drinking water, electronics and power industries..
It's a 4-inch diameter ,40-inch long membrane , typically made from a thin-film composite material .
This membrane effectively filters out salts , heavy metals , chlorine, fluoride, and other impurities, leaving behind cleaner water.
Advantages
- Select the highest quality sheet for optimal performance, with an element rejection rate of ≥96%.
- Longer life cycle and extensive experience usage up to 5 years
- 1pcs order is acceptable
- Dry or moist types are flexible.
- OEM & ODM are available.
Comparasion
Performance can compeletely replace below:
Dopunt Filmtec BW30-4040
Hydranautics CPA2-4040
Toray , LG, Vontron BW sereis 4040
Applications
Drinking Water Production
Used in water purification systems for producing potable water from brackish sources.
01
Industrial Process Water
Provides high-quality water for manufacturing processes, cooling towers, boilers, and other industrial systems where water purity is critical.
Helps prevent scaling and corrosion in equipment.
02
Desalination of Brackish Water
Effective for brackish groundwater or surface water with TDS typically up to 2000–5000 mg/L.
Not suitable for seawater desalination (too high TDS for standard BW membranes).
03
Food & Beverage Applications
Provides ultrapure water needed for beverage production, food processing, or pharmaceutical uses.
04
Agriculture & Irrigation
Produces low-salinity water for irrigation in sensitive crops that cannot tolerate high salt concentrations.
05
How to guarantee the high quality BW-4040
Advanced and professional membrane sheet formula manufacture
Strictly select the most suitable membrane sheet for different request of customers in different countries.
Choose the higher perfrmance spare parts of membrane element
Pay seriously higher attention to the package
Strictly testing each pcs
About us
Hangzhou Puri-guard Water Treatment is a professional manufacturer , we have our production experience for 15 years .
we have our products series of RO membranes includes BW, LE, XLP type, NF membrane , SWRO membrane, UF membrane ,HSRO membrane ,DTRO/STRO membrane.
our products well exported to Europe, Middle East , Vietnam , India , Korea, etc . We strictly select the best suitable components to produce the high reputation products , whatever on quality and also cost support .warmly welcome to contact with us ,anytime.
FAQ
Q: What is BW-4040 RO membrane used for?
A: BW-4040 RO membrane is a brackish water reverse osmosis membrane, designed for removing dissolved salts and impurities from low- to moderately-saline water. It's commonly used in industrial, commercial, and municipal applications.
Q: Can fully replace the Dopunt BW30-4040?
A: BW-4040 is our standard mature type with 14 years experience , can fully reaplce Filmtec BW30-4040 with better price but truth fimilar performance .
Q: How long does BW-4040 membrane lifecycle ?
A: Based on the feedwater quality and using condition , normally is 2-3 years , our customers use this type till 5 years base don professional maintance and good pretreatment .
Q: What pressure recommend in BW-4040 membrane actual using condition ?
A: For the BW-4040 brackish water RO membrane, the recommended operating pressure depends on the feed water salinity (TDS) and temperature. Here's a detailed guide based on typical manufacturer specs:
Minimum pressure: ~100 psi (~0.7 MPa) – helps maintain sufficient flow
Typical operating pressure: 200–400 psi (~1.4–2.8 MPa) for standard brackish water
Maximum operating pressure: 600 psi (~4.1 MPa) – exceeding this can damage the membrane
Note: Pressure must be adjusted based on feed water TDS. Higher TDS requires higher pressure to maintain designed permeate flow.
Q: How is the delivery and payment conditions?
A: We are professional manufature with our capacity 300pcs/day normally , as we have also production on domestic and industrial 8040 .So delievry normally 15-20 working days after confirming the order and get deposit payment.
Payment terms : Choices can be made based on different orders and cooperations.
Q: Is OEM and ODM is acceptable ?
A: Absolutely fully support .
Quality First , Trust as Basic, Service Creates Future
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|
Puri-guard® Element |
Permeate Flow GPD (m3/d) |
Testing Pressure |
Salt Rejection (%) |
Tested condition |
|
|
psi/MPa |
NaCl |
||||
|
BW-4040 |
2400 (9.1) |
225/1.55 |
99.6-99.7 |
2000ppm |
|
1. Permeate flow and salt (NaCl) rejection based on the standard test conditions. 77°F (25°C), pH 7.5, 15% ± 1.0 recovery and the specified applied pressure.
2. Minimum salt rejection: 1-2% less of Salt rejection marked.
3. Single membrane element production flow may vary ±15%.
Operating limit
|
Diaphragm type |
Polyamide Composite Membrane |
|
Maximum operating temperature |
113℉ (45℃) |
|
Maximum operating pressure |
150 psi (10 bar) |
|
pH range, continuous operation |
3-10 a |
|
Maximum Influent SDI |
5 |
|
Free chlorine tolerance |
<0.1 ppm b |
a. When pH > 10, the maximum allowable temperature for continuous operation is 95℉ (35℃).
b. Under certain conditions, the presence of free chlorine and other oxidants will lead to premature failure of membranes. Therefore, it is recommended that the membrane be pretreated to remove residual free chlorine before water comes into contact with membranes.
|
Puri-guard® Element |
A (±2.0mm) |
B (±1.0mm) |
C1 (±1.0mm) |
C2 (±1.0mm) |
D (±0.1mm) |
|
(mm) |
(mm) |
(mm) |
(mm) |
(mm) |
|
|
4040 |
1016 |
100 |
26.7 |
26.7 |
19.1 |
The water flux listed in the table of technical parameters is the average value, and the error of the water flux of a single membrane element is ±15%.
Before the membrane components leave the factory, the dry membrane components have no protective liquid, and the wet membrane components use 1.0% sodium bisulfite (10% glycerol antifreeze is added in winter) solution for storage and vacuum packaging.
Dry elements should always be kept wet after wetting.
When the membrane element is used for the first time, it is recommended to first rinse at low pressure for 15-25 minutes, and then rinse at high pressure for 60-90 minutes (the water flux is not less than 50% of the system design water flux). The water produced and concentrated water within the first hour of the initial operation of the membrane element should be completely discharged.
