8"x40" | 12,650GPD | 150psi | 99.5%Rej | Interlocking | FilmTec

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Manufacturer DOW Filmtec

DOW FilmTec Membrane Elements

DOW FILMTEC™ HRLE-440i High Rejection, Low-Energy RO Element with iLEC Interlocking Endcaps

Featuring breakthrough membrane chemistry, the DOW FILMTEC HRLE-440i element delivers the same 99.5% nominal NaCl rejection as traditional brackish water elements but at 33% lower pressures. Lower energy requirements allow new reverse osmosis systems to be designed to use one third less energy and still deliver the same permeate quality compared with other BW elements. Existing low energy systems can be retrofitted to achieve lower permeate TDS than possible with previous low energy elements.  The combination of low energy and high rejection is ideally suited for use in the second pass of seawater and high-purity applications.

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.

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

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

Product Specifications for FilmTec SW30HRLE-440i Seawater Membrane

 FilmTec Membranes are FDA Compliant     Genuine DOW FilmTec Membrane Element   


Specifications for HRLE-440i

FilmTec Product: HRLE-440i
FilmTec Part Number: 347733
Size (Approximate): 8" Dia. x 40"L
Flow Rate: 12,650 gpd (48 m³/d)
Applied Pressure: 150 psig (10.3 bar)
Stabilized Salt Rejection: 99.5%
Minimum Salt Rejection: 99.3%
Stabilized Silica Rejection: 99.8%
Stabilized Boron Rejection: 68%
Stabilized Nitrate Rejection: 97%
Stabilized Ammonium Rejection: 97.5%
Stabilized Isopropyl Alcohol Rejection: 94%
Active Surface Area: 440 Sq. Ft.
Single Element Recovery: 15%
End Style: iLEC Interclocking
Exterior: Hard Shell Fiberglass
Feed Spacer: 28 mil
Membrane Type:
Advanced Polyamide Thin-Film Composite

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

Operating Limits for HRLE-440i

Maximum Operating Temperature: 113°F (45°C)
Maximum Operating Pressure: 600 psig (41 bar)
Maximum Pressure Drop: 15 psig (1 bar)
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 HRLE-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

  • 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.
  • Decades of proven performance
  • Delivers high quality permeate water while minimizing CAPEX and OPEX
  • Offers the most effective cleaning performance, robustness and durability due to its widest cleaning pH range (1-13) and chemical tolerance and the support of Dow technical representatives
  • High rejection results in excellent water quality and decreased downstream polishing
  • Thick feed spacer minimizes the impact of fouling
  • FilmTec performance and quality

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

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

Physical Dimensions of DOW FilmTec HRLE-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)

HRLE-440I fits nominal 8" ID pressure vessels.

For more information, please visit this products webpage.