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   Membrane      11418342116
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Type : BW30-400
Function : RO System
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Availability : total 1000 items, Sold pieces 0 items, Pieces Left 0 items
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Detailed Information


DOW™ FILMTEC™ Membranes


DOW FILMTEC BW30-400 High Rejection, High Surface Area Brackish Water RO Element





The DOW. FILMTEC. BW30-400 is the product of choice when the highest quality permeate is required. It was the first 400 square foot membrane element on the market and continues to be widely used in new equipment and retrofits where system capital and productivity are factors.


1. Dow’s superior automated manufacturing technology results in the most consistent performance element-to-element and year-after-year.

2. BW30-400 elements deliver high flow and high rejection without being chlorinated during the manufacturing process. This is one reason why DOW FILMTEC elements are more durable and may be cleaned over a wider pH range (pH 1-13) than other RO elements.

3. With more than a decade of proven performance, BW30-400 is the product you can rely on for years of trouble-free operation.


Product Specifications



Part number

Active area ft2 (m2)

Feed spacer thickness (mil)

Permeate flow rate gpd (m3/d)

Stabilized salt rejection (%)

Minimum salt rejection (%)



400 (37)


10,500 (40)



1. Permeate flow and salt rejection based on the following standard conditions: 2,000 ppm NaCl, 225 psi (15.5 bar), 77°F (25°C), pH 8 and 15% recovery.

2. Flow rates for individual elements may vary but will be no more than 15% below the value shown.

3. Sales specifications may vary as design revisions take place.

4. Active area guaranteed +/-3%. Active area as stated by Dow is not comparable to nominal membrane area often stated by some manufacturers. Measurement method described in Form No. 609-00434.






40.0 (1,016)

1.125 ID (29)

7.9 (201)

1. Refer to Dow Film Tec Design Guidelines for multiple-element applications and recommended element recovery rates for various feed sources. 1 inch = 25.4 mm

2. Element to fit nominal 8.0-inch (203 mm) I.D. pressure vessel.


Operating Limits


Membrane Type

Polyamide Thin-Film Composite

Maximum Operating Temperaturea

113°F (45°C)

Maximum Operating Pressure

600 psig (41 bar)

Maximum Pressure Drop

15 psig (1.0 bar)

pH Range, Continuous Operationa


pH Range, Short-Term Cleaning (30 min.)b


Maximum Feed Flow

85 gpm (19 m3/hr)

Maximum Feed Silt Density Index


Free Chlorine Tolerancec

< 0.1 ppm

a Maximum temperature for continuous operation above pH 10 is 95°F (35°C).

b Refer to Cleaning Guidelines in specification sheet 609-23010.

c Under certain conditions, the presence of free chlorine and other oxidizing agents will cause premature membrane failure. Since oxidation damage is not covered under warranty, Dow recommends removing residual free chlorine by pretreatment prior to membrane exposure. Please refer to technical bulletin 609-22010 for more information.


Important Information


Proper start-up of reverse osmosis water treatment systems is essential to prepare the membranes for operating service and to prevent membrane damage due to overfeeding or hydraulic shock. Following the proper start-up sequence also helps ensure that system operating parameters conform to design specifications so that system water quality and productivity goals can be achieved. Before initiating system start-up procedures, membrane pretreatment, loading of the membrane elements, instrument calibration and other system checks should be completed. Please refer to the application information literature entitled “Start-Up Sequence” (Form No.

609-02077) for more information.


Operation Guidelines


Avoid any abrupt pressure or cross-flow variations on the spiral elements during start-up, shutdown, cleaning or other sequences to prevent possible membrane damage. During start-up, a gradual change from a standstill to operating state is recommended as follows:

1. Feed pressure should be increased gradually over a 30-60 second time frame.

2. Cross-flow velocity at set operating point should be achieved gradually over 15-20 seconds.

3. Permeate obtained from first hour of operation should be discarded.


General Information


1. Keep elements moist at all times after initial wetting.

2. If operating limits and guidelines given in this bulletin are not strictly followed, the DOW™ FILMTEC™ Reverse Osmosis and Nanofiltration Three-Year Prorated Limited Warranty (Form No. 609-35010) will be null and void.

3. To prevent biological growth during prolonged system shutdowns, it is recommended that membrane elements be immersed in a preservative solution.

4. The customer is fully responsible for the effects of incompatible chemicals and lubricants on elements.

5. Maximum pressure drop across an entire pressure vessel (housing) is 50 psi (3.4 bar).

6. Avoid static permeate-side backpressure at all times.


Regulatory Note


These membranes may be subject to drinking water application restrictions in some countries: please check the application status before use and sale.

Notice: The use of this product in and of itself does not necessarily guarantee the removal of cysts and pathogens from water. Effective cyst and pathogen reduction is dependent on the complete system design and on the operation and maintenance of the system.

Notice: No freedom from any patent owned by Dow or others is to be inferred. Because use conditions and applicable laws may differ from one location to another and may change with time, Customer is responsible for determining whether products and

the information in this document are appropriate for Customer's use and for ensuring that Customer's workplace and disposal practices are in compliance with applicable laws and other government enactments. The product shown in this literature may not be available for sale and/or available in all geographies where Dow is represented. The claims made may not have been approved for use in all countries. Dow assumes no obligation or liability for the information in this document. References to "Dow" or the "Company" mean the Dow legal entity selling the products to Customer unless otherwise expressly noted. NO WARRANTIES ARE GIVEN; ALL IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE ARE EXPRESSLY EXCLUDED.


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