4"x21" | 900 GPD | Tape Wrapped | DOW FilmTec RO Membrane
SKU: 42958947317

4"x21" | 900 GPD | Tape Wrapped | DOW FilmTec RO Membrane

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Description

4"x21" | 900 GPD | Tape Wrapped | DOW FilmTec RO MembraneDOW FILMTEC TW30 4021 Commercial Reverse Osmosis Membrane Element DOW FILMTEC TW30 4021 Reverse Osmosis (RO) Elements offer high quality water for small commercial systems. DOW FILMTEC TW30 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





DOW FILMTEC™ TW30-4021 Commercial Reverse Osmosis Membrane Element



DOW FILMTEC TW30-4021 Reverse Osmosis (RO) Elements offer high quality water for small commercial systems. DOW FILMTEC TW30-4021 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 TW30-4021 is FDA – 21 CFR 177.2550; Food and Drug Administration Compliant.



Specifications for TW30-4021



FilmTec Product:

TW30-4021


FilmTec Part Number:

80608
Size (Approximate): 4" Dia. x 21"L


Flow Rate:

900 gpd (3.41 m³/d)


Applied Pressure:

225 psig (15.5 bar)


Stabilized Salt Rejection:

99.5%


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: 2,000 ppm NaCl feed stream, 77°F, 8% recovery, 225 psig.



Operating Limits for TW30-4021



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:

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 TW30-4021

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



  • 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 TW30-4014 Commercial RO Membranes:



  • Commercial Water Treatment Systems


  • Food Service


  • Medical and Research Institutions


  • Hospitality Industry



Physical Dimensions of DOW FilmTec TW30-4014

INCHES (MM)
A

21.0 (533)
B

1.05 (27)
C

0.75 (19)
D

3.9 (99)

TW30-4021 Fits nominal 4x21 size pressure vessels.

For more information, please visit this products webpage.
Shipping Notes
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Exchange/Return Notes
  • We offer a 30-day return/exchange service after receiving.
  • Final sale items are not eligible for returns or exchanges.
  • To process your return/exchange, please contact us at [email protected]
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SKU: 42958947317

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DJ
Carnegie, US
★★★★★ 5
Great quality, Highly Impressed!
Size: 12, Color: Light Brown
These are of great quality and surprisingly comfortable. This is my first pair of HEYDUDE. I am really impressed! They are true to size. They fit my wide feet without any issues and they are my new absolute favorites! Super lightweight, extra stylish with the platform lift, and completely worth it. The color matches the photos.
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Reviewed in the United States on May 29, 2026
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Verified Purchase
Thryn.R.
Waukegan, US
★★★★★ 5
Slip on shoe love
Size: 9, Color: Black/Black, Size: 9, Color: Black/Black
These are a more narrow fit so if you are a wide fit girlie or you don’t like tight fitting shoes you might want to try to size up or try to find something that has a wide version. But I love them super cute and absolutely great quality..skip on and slip off love it!!! I will be looking into a different color,I got black for work ..but they are comfortable . Update-after wearing the black suede for a few days I purchased the brown suede as well.... And I can say they do loosen up a little still a a narrow fit but not right feeling.
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Reviewed in the United States on May 2, 2026
M
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marina p.
Omaha, US
★★★★★ 5
Walking on clouds…
Size: 6, Color: Blush, Size: 6, Color: Blush
The most comfortable shoes I have ever had. Usually I wear size 6,5 -7. I followed recommendations and order size 6. It was a perfect fit. It was ideal for my problematic wide feet. The shoes are light weight and well made. They look great and feel as cozy as slippers. Absolutely love them and strongly recommend to go size down as I did.
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Reviewed in the United States on April 11, 2026
J
Verified Purchase
jb
Los Angeles, US
★★★★★ 5
Comfort and fashion collide
Size: 7, Color: Brown Leopard
These platform mules meet the following three criteria points: fashionable, comfortable, and affordable. I wear them all day thanks to the great arch support. In fact, I have three pairs in multiple colors. I normally wear a 7.5 but sized down to 7 after trying a 7 and 8.
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Reviewed in the United States on June 2, 2026
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Amazon Customer
Fort Morgan, US
★★★★★ 4
Nice looking, quality is iffy 🤷🏻‍♀️
Size: 7, Color: Black Leather
Love the look of these, nice and comfortable, or so I thought. I wore them for the first time yesterday and they rubbed the top of my foot. I hate that they are lined in a fabric that causes friction. I kept them because I loved the look of them, but, in all honesty I think they are expensive for the quality. My right shoe has scrub marks on the leather :-(
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on March 23, 2026

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