SKU: 89540922305

4"x21" | 1,025 GPD | Low Energy | Tape Wrap | FilmTec Membrane

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Description

4"x21" | 1,025 GPD | Low Energy | Tape Wrap | FilmTec MembraneDOW FILMTEC XLE 4021 Low Energy Reverse Osmosis Membrane Element DOW FILMTEC XLE 4021 Elements offer better system performance and economics for small commercial systems by operating at very low applied pressure. DOW FILMTEC XLE 4021 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





DOW FILMTEC™ XLE-4021 Low Energy Reverse Osmosis Membrane Element



DOW FILMTEC XLE-4021 Elements offer better system performance and economics for small commercial systems by operating at very low applied pressure. DOW FILMTEC XLE-4021 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-4021 is FDA – 21 CFR 177.2550; Food and Drug Administration Compliant.



Specifications for XLE-4021



FilmTec Product:

XLE-4021


FilmTec Part Number:

154540
Size (Approximate): 4" Dia. x 21"L


Flow Rate:

1,025 gpd (3.9 m³/d)


Applied Pressure:

100 psig (6.9 bar)


Stabilized Salt Rejection:

99.0%


Active Surface Area:

36 Sq. Ft.


Single Element Recovery:

8%


Exterior:

Tape-Wrapped


Membrane Type:

Polyamide Thin-Film


Composite

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



Operating Limits for XLE-4021



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:

14 gpm (3.2m³/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-4021

PV4021SSAU-316 Stainless Steel Membrane Housing Pressure Vessel for 4" x 21" Membrane Element
PV4021PWG PVC Membrane Housing Pressure Vessel for 4" 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-4014 Commercial RO Membranes:



  • Commercial Water Treatment Systems


  • Food Service


  • Medical and Research Institutions


  • Hospitality Industry



Physical Dimensions of DOW FilmTec XLE-4014

INCHES (MM)
A

21.0 (533)
B

1.05 (27)
C

0.75 (19)
D

3.9 (99)

XLE-4021 Fits nominal 4x21 size pressure vessels.

For more information, please visit this products webpage.
Shipping Notes
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Exchange/Return Notes
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SKU: 89540922305

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Chris
Draper, US
★★★★★ 5
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Scent: Sweet Vanilla & Soft Wood, Size: 18.5 Fl Oz (Pack of 1)
I've only tried it for the first time, so I can't speak to performance, but I love 5his Product! It isn't greasy, it absorbs quickly & my skin feels much softer. The scent is just beautiful. It's light & not closing like some. Recommend highly.
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Reviewed in the United States on May 18, 2026
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Omaha, US
★★★★★ 5
Love
The Dove body serums are amazing , I hope they never stop selling them. My skin feels and looks great since I’ve been using Dove beauty bars, cream serums and their body Deo. Great scents and great for my skin. This body serum is light has a very light floral scent and leaves my skin feeling great and like most Dove products at a great price. Time will tell if it helps to lighten dark spots, I’ll update my review in two weeks but for now… I love this stuff, my skin is super soft without heavy creams.
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Reviewed in the United States on May 6, 2026
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Zenia
Alexandria, US
★★★★★ 5
Gentle,hydrating,and helping even out my skin tone
I’ve been using this Dove Body Serum with niacinamide for just a few weeks, and I’m already noticing a visible improvement in my skin. During pregnancy, I developed some uneven skin tone and dark patches, and this has been helping my skin look more even and healthy. It feels lightweight, absorbs well, and keeps my skin soft and hydrated without feeling greasy. My skin already looks smoother and brighter, and I’m really happy with the results so far. Definitely a great body moisturizer if you’re looking for hydration plus gradual skin tone improvement.
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Reviewed in the United States on April 27, 2026
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Mimi
Chelsea, US
★★★★★ 5
Love love love!!
I LOVE this lotion. It's extremely lightweight, doesn't have a strong odor, and it's actually moisturizing! It's light enough to where I use it on my face as well and it doesn't feel greasy at all. No skin irritation or anything and I have sensitive skin. HIGHLY recommend.
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Reviewed in the United States on May 22, 2026
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Abigail Carcamo
Birmingham, US
★★★★★ 5
Smoother skin in no time
I’ve been using it daily for a couple of weeks, and I really have noticed that my skin tone is more even. I had some dry patches and areas darkened by the sun, and they look much better now. It’s lightweight, but it provides good hydration all day long. For the price, I feel it’s well worth it.
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