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  Top » Catalog » Membranes » FILMTEC/DOW RO Membranes » DOW FilmTec 8" Brackish Water Industrial RO Membranes » BW30-440I

8"x40" | 11,500GPD | 99.5%Rej | Interlocking | FilmTec Membrane

8"x40" | 11,500GPD | 99.5%Rej | Interlocking | FilmTec Membrane
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Model BW30-440I
Price $900.00  632.00 
Manufacturer DOW Filmtec
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DOW FilmTec Membrane Elements

DOW FILMTEC BW30-440i High Rejection RO Membrane Element

The DOW FILMTEC BW30-440i element is a high-productivity element combining the highest active membrane area available with the high rejection BW30 reverse osmosis membrane. It is designed to minimize capital expenses in high-purity industrial water applications without increasing operating flux. The elements uses iLEC™ interlocking end caps which reduce system operating costs and the risk of o-ring leaks that can cause poor water quality.

DOW FILMTEC Brackish Water Reverse Osmosis 8" Elements can separate salts from water and are produced with an automated fabrication process that ensures precision, consistency, and reliability. They are ideal for use in large-scale industrial and municipal water treatment systems that produce greater than approximately 10 gpm (2300 L/h) of permeate. Our RO membranes build on a tradition of leadership in the thin-film composite membrane industry and meet today's challenges for higher rejection using less energy and resisting foulants in challenging waters.

BW30-440i is iLEC interlocking style for direct connection of membranes in multi-element housings.
DOW FilmTec Interlocking RO Membranes 

DOW FILMTEC BW30-440i is FDA – 21 CFR 177.2550; Food and Drug Administration Compliant.

Product Specifications for EZ SDI Silt Density Index Monitor FilmTec Membranes are FDA Compliant     Genuine DOW FilmTec Membrane Element   


Specifications for BW30-440i

FilmTec Product: BW30-440i
FilmTec Part  Number: 249107
Size (Approximate): 8" Dia. x 40"L
Flow Rate: 11,500 gpd (43 m³/d)
Applied Pressure: 225 psig (15.3 bar)
Stabilized Salt Rejection: 99.5%
Minimum Salt Rejection: 99.0%
Active Surface Area: 440 Sq. Ft.
Single Element Recovery: 15%
End Style: iLEC Interclocking
Exterior: Hard Shell Fiberglass
Feed Spacer: 28 mil
Membrane Type:
Polyamide Thin-Film

Permeate flow and salt rejection based:  2,000 ppm NaCl feed stream, 77°F, 15% recovery, 225 psig.

Operating Limits for BW30-440i

Maximum Operating Temperature: 113°F (45°C)
Maximum Operating Pressure: 600 psig (41 bar)
Maximum Pressure Drop: 15 psig (1 bar)
Maximum Feed Flow Rate: 85 gpm (19m³/h)
pH Range, Continuous Operation*: 2-11
pH Range, Short-Term Cleaning**: 1-13
Maximum Feed Silt Density Index: SDI 5
Fere Clorine Tolerance***: <0.1ppm

*Maximum temperature for continuous operation above pH 10 is 95°F
**Refer to cleaning guidelines.
***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.

Related Products for use with BW30-440i

AS-135-500 Flocon 135 Antiscalant Scale Inihibitor for Brackish or Seawater Systems Operating at High Recovery
AM-11-25 RO Membrane Cleaning Chemicals - Acid Cleaner to Remove Scale
AM-22-25 RO Membrane Cleaning Chemicals - Alkaline Cleaner to Remove  Organics

Benefits of DOW FilmTec Commercial RO Membranes

  • Decades of proven performance
  • BW30 elements provide longer life due to increased resistance to fouling and high cleanability.
  • iLEC™ interlocking elements connect end-to-end inside of the housing, eliminating the need for membrane interconnectors and offering the following benefits:
    • ​Reliable and long-term seal integrity – The single, non-sliding seal reduces the number of potential leak sites and is evenly compressed upon installation.
    • Leak-tight performance – The iLEC design eliminates the possibility of o-rings being rolled from their grooves or pinched and damaged during operation.
    • Lubricant-free operation – Omission of o-ring lubricant to preserve permeate quality, such as in ultra-pure water applications, will not compromise sealing performance.
    • Backward compatibility – Compatibility with existing hardware is maintained.  The smooth inner bore located at  each end of the permeate collection tube is unchanged, permitting insertion of sliding couplers and existing vessel adapters.  The net length of the elements, when connected, remains 40 inches.
    • Reduced permeate pressure drop – Internal couplers and vessel adapters account for more than 70 percent  of the permeate-tube pressure drop in some systems. The interlocking endcap design minimizes these restrictions, imposing less permeate backpressure.
  • FilmTec performance and quality

Common Applications for FilmTec BW30-440i Commercial RO Membranes:

  • Industrial Water Demineralization
  • Production of Municipal Water
  • Water Reuse

Physical Dimensions of DOW FilmTec BW30-440i

DOW FilmTec 8-Inch RO Membrane Drawing  
A 40.0 (1,016)
B 40.5 (1,029)
C 7.9 (201)
D 1.125 ID (29 ID)

BW30-440i fits nominal 8" ID pressure vessels.


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