2.5"x21" | 365 GPD | Low Energy | Tape Wrap | FilmTec Membrane

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Brand DOW Filmtec

DOW FilmTec Membrane Elements

DOW FILMTEC™  XLE-2521 Low Energy Reverse Osmosis Membrane Element

DOW FILMTEC TW30-2521 Elements produce high quality water for small commercial systems. DOW FILMTEC TW30-2521 elements are tape-wrapped. In addition to high quality water and low energy costs, DOW FILMTEC membranes also deliver savings by providing long lasting and reliable performance.

DOW FILMTEC Brackish Water Reverse Osmosis Elements can separate salts from water and are produced with an automated fabrication process for precision, consistency, and reliability. DOW FILMTEC RO membranes build on a tradition of leadership in the thin-film composite membrane industry and meet the challenges of higher rejection in lower-pressure operations.

DOW FILMTEC XLE-2521 is FDA – 21 CFR 177.2550; Food and Drug Administration Compliant.

Product Specifications


FilmTec Membranes are FDA Compliant     Genuine DOW FilmTec Membrane Element   



Specifications for XLE-2521

FilmTec Product: XLE-2521 
FilmTec Part Number: 154530
Size (Approximate): 2.5" Dia. x 21"L
Flow Rate: 365 gpd (1.38 m³/d)
Applied Pressure: 100 psig (6.9 bar)
Stabilized Salt Rejection: 99.0%
Active Surface Area: 13 Sq. Ft.
Single Element Recovery: 10%
Exterior: Tape-Wrapped
Membrane Type:
Polyamide Thin-Film

Permeate flow and salt rejection based:  500 ppm NaCl feed stream, 77°F, 8% recovery, 100 psig.

Operating Limits for XLE-2521

Maximum Operating Temperature: 113°F (45°C)
Maximum Operating Pressure: 600 psig (41 bar)
Maximum Pressure Drop: 13 psig (0.9 bar)
Maximum Feed Flow Rate: 6 gpm (1.4m³/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 XLE-2521

PV2521PVCAU PVC Membrane Housing Pressure Vessel for 2.5" x 21" Membrane Element
PV2521SSAU-316 Stainless Steel Membrane Housing Pressure Vessel for 2.5" x 21" Membrane Element

Benefits of DOW FilmTec Commercial RO Membranes

  • Lower Operating Pressure reduces power consumption, lowering the cost of equipment and operation.
  • Reverse Osmosis water treatment removes up to 99% of total dissolved solids from water.
  • High flux results in high yields
  • High rejection provides good water quality
  • FilmTec performance and quality

Common Applications for FilmTec XLE-2521 Commercial RO Membranes:

  • Commercial Water Treatment Systems
  • Food Service
  • Medical and Research Institutions
  • Hospitality Industry

Physical Dimensions of DOW FilmTec XLE-2521

DOW FilmTec Commercial RO Membrane Drawing  
A 21.0 (533)
B 1.19 (30)
C 0.75 (19)
D 2.4 (61)

XLE-2521 Fits nominal 25x21 size pressure vessels.

For more information, please visit this products webpage.