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
  • Free Standard Shipping on $100+ Orders to the USA.
  • Except Preorder products are shipped in 48 hours.
  • Delivery to the USA:
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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]
  • Please click here for more details>>> Return & Exchange Policy
SKU: 42958947317

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J. Johnson
Carnegie, US
★★★★★ 5
Flavorful
Flavor Name: Traditional, Size: 2 Ounce (Pack of 3)
Best jerky ever I love everything about it! Jeff Johnson
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on April 3, 2026
D
Verified Purchase
David A.
New York, US
★★★★★ 5
Excellent flavor and texture to this jerky with no sugar makes it my new favorite
Flavor Name: Traditional, Size: 4 Ounce (Pack of 1)
I have recently adopted a low carb, high protein diet combined with weight training, so I'm always looking for new sources of protein. I use protein powder as little as possible, and eat more from natural sources. I have a brand of beef jerky I really like, but traditional beef jerkies have a lot of sugar (10g protein to 6g of sugar). Biltong, however, has more protein per oz (16g) and 0g of carbs or sugar. Simple ingredients, and nothing funky. So a big win on the nutrition front. That is great, but what won me over was the flavor. It has a nice hearty flavor, and has a little wetness to it that makes the texture nice to chew. I have tried another brand of biltong, but I found it too dry for my taste (kinda of like chewing on plastic). So another win on flavor and texture. Pricing is okay. Good beef jerky is not cheap, so you get what you pay for. I would like to buy in bulk, so bigger packages with better discounts would be a good offer I would jump on immediately.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 22, 2019
A
Verified Purchase
Amazon Customer
Lexington, US
★★★★★ 5
Good Product
Size: 3 Panel-102'', Color: Beige
I got these dividers for outdoor use for some privacy from neighbors. They arrived quickly and were easy to set up. They look good, and though the legs don’t offer stability against any amount of wind—which I expected as it wasn’t advertised for outdoor use—all it took was placing a cinder block on the feet to hold it up right. Coverage is good, it’s easy to fold and move as needed, and it’s light weight. All in all a decent product. I will caution the purchase of “used like-new,” as both of the dividers I ordered were previously returned items, and one came missing a cap, instructions were not included, and the poles were all mixed up and not properly labeled. If I had not ordered a second divider (which did include the instructions) I would have had a much harder time figuring out which pieces were which and how to put them together.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 30, 2025
J
Verified Purchase
julie h.
New York, US
★★★★★ 5
So versatile! Perfect solution for dividing a room.
Size: 4 Panel-88'', Color: Grey, Size: 4 Panel-88'', Color: Grey
Perfect solution for my space. My office has to double as the hangout room for the kids and I wanted something that would block off my computer so it is left alone. This space allows me to close off my computer as much or as little as I want. It is lightweight yet has sturdy feet. This is important so that if it gets bumped it won’t topple over. The price was great and the build time wasn’t too bad! I would recommend two people for set up. I went with the grey panels and I think I’ll end up hanging some twinkle lights at some point. Great purchase!
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Reviewed in the United States on October 9, 2025
A
Verified Purchase
Abbi
Louisville, US
★★★★★ 4
4/5 Stars
Size: 4 Panel-88'', Color: Black
Very tall and easy to set up, the only thing I will say is that they do have large gaps in between, so you won't have 100% privacy unless you add a curtain in the back. Other than that, they are easy to fold, sturdy, and esy to assemble. The gaps are an easy fix so I would say they are worth it.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on April 16, 2026

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