SKU: 69581433787

4" x 21" | 900 GPD Commercial Reverse Osmosis RO Membrane | Applied Membranes

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Description

4" x 21" | 900 GPD Commercial Reverse Osmosis RO Membrane | Applied Membranes4" x 21" Reverse Osmosis Membrane Tap or Brackish Water 900 GPD RO Membrane AMI commercial RO membrane elements produce high quality water from tap or brackish water in small commercial RO systems, and are among the finest in the industry. With hundreds of thousands of membranes in operation in water filtration systems world wide, AMI membranes have earned a reputation of delivering consistent, reliable, and long lasting performance, making AMI


4" x 21" Reverse Osmosis Membrane | Tap or Brackish Water | 900 GPD RO Membrane

AMI commercial RO membrane elements produce high quality water from tap or brackish water in small commercial RO systems, and are among the finest in the industry. With hundreds of thousands of membranes in operation in water filtration systems world-wide, AMI membranes have earned a reputation of delivering consistent, reliable, and long lasting performance, making AMI Membranes the natural choice for use in small commercial RO systems. AMI Small Commercial RO Membranes are constructed of tap water TFC (thin film composite) membrane material and fit standard PVC and Stainless Steel RO Membrane Housings.

AMI Membranes are 100% Quality and Performance Tested in their ISO 9001:2015 Certified Facilities.

Specifications for M-T4021A

AMI Part Number: M-T4021A
Membrane Size (Nominal): 4 x 21
Membrane Dimensions: 3.9"Dia. x 21"L
Flow Rate: 900 GPD (3,407 LPD)
Applied Pressure: 225 psi (1.6 MPa)
Stabilized Salt Rejection: 99.5%
For Housing: Standard 4" x 21"
Outer Wrap: Tape Wrapped
Membrane Type: Tap or Brackish Water
Membrane Sheet: TFC (Thin Film Composite)
Element Type: Spiral Wound
Feed Water Test Temperature: 77°F (25°C)
Single Element Recovery: 8%
Chlorine Tolerance: 0
Feed water pH Range: 2-11
Can Replace:




 DOW FilmTec TW30-4021
DuPont TW30-4021 80608
GE Desal AG4021TM
GE Desal AG4021TF
Axeon HR3-4021
Manufacturer: Applied Membranes, Inc.
Country of Manufacture: United States (USA)

Note: Performance specifications based on 2,000 mg/l sodium chloride, 225 psi (1.6 MPa) applied pressure, 77ºF (25ºC) feed water temperature, pH 8 and the recovery listed in the table above. Element permeate flow may vary ± 20%.

Features of AMI Tap Water / Brackish Water RO Membranes

  • High Rejection & Flow Rate
  • Manufactured in our ISO 9001:2015 Certified Facilities
  • 100% Performance and Quality Tested
  • Backed by our Experienced Technical Support Staff
  • High Quality for Consistent and Reliable Performance
  • Uses the most advanced membrane film technology and manufacturing processes
  • Standard dimensions to fit in commonly available housings

Applications for AMI Commercial RO Membranes

  • Restaurants
  • Aquariums
  • Whole House (Residential)
  • Office
  • Institutions
  • Hotels
  • Hospitals
  • Disaster Relief
  • Spot Free Rinse/Car Wash
  • Labs
  • Pharmaceutical
  • Humidification
  • Misting
  • Manufacturing
  • Rinse Water
  • Bottled Water
  • Water stores
  • Beverage
  • Food Processing
  • Ice Makers
  • Commercial Water Treatment
  • Ice Makers
  • Tap Water
  • Brackish Water
  • Wide Variety of Other Applications

Physical Dimensions of M-T4021A:

Total Length (L):

21 In. (53.3 cm)

Membrane Length (I):

19 In. (48 cm)

Diameter (D):

3.9 In. (9.9 cm)

PWT (P):

0.75 In. (1.9 cm)

Replacement Compatibility for AMI 4 X 21 RO MEMBRANES

Applied Membranes M-T4021A membrane elements can be used as direct replacement for many industry-standard 4x21 size RO elements with 3/4" male product water tubes ("stinger style") which are rated at 225psi. These include DuPont DOW FilmTec TW30-4021 (80608), GE Desal AG4021TM (1206750, AG4021TF), and Axeon HR3-4021.

If you do not see your membrane listed or wish to learn more about compatibility, please contact us. Our certified water treatment experts will be happy to discuss your application. To ensure prompt and accurate information, please include as much information about your system as possible, such as: model, manufacturer, model of membranes being replaced, any available. product manuals or literature associated with your system, and photographs of your system or membranes.

Shipping Notes
  • Free Standard Shipping on $100+ Orders to the USA.
  • Except Preorder products are shipped in 48 hours.
  • Delivery to the USA:
  1. Standard Shipping : 3-10 business days
  • If time is of the essence, please consider selecting expedited delivery for faster service.
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: 69581433787

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Tamara R.
Los Angeles, US
★★★★★ 5
Healthy Trail Mix That Fits My Dietary Needs Perfectly
Flavor Name: Healthy Trail Mix, Size: 1.2 Ounce (Pack of 72)
This trail mix has become one of my new favorite snacks, and I’m really impressed with it. The variety of flavors in the pack keeps things interesting, so I never get bored eating the same thing over and over. Each mix has a great balance of nuts, dried fruit, and other goodies, and everything tastes fresh and high quality. I also really appreciate the portion size of each bag. It’s just right for a satisfying snack—enough to keep me full between meals without feeling like I’ve overdone it. The convenient packaging makes it easy to take on the go, whether I’m working, traveling, or just need a quick bite. As someone who is gluten free and dairy free, finding a snack that actually tastes great and still meets my dietary needs can be a challenge. I love that this trail mix fits perfectly into my lifestyle so I don’t have to worry about hidden ingredients. It’s become a staple in my pantry, and I will definitely keep buying it. Five stars!
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Reviewed in the United States on January 26, 2026
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k. bar.
Phoenix, US
★★★★★ 5
Healthy & Convenient Snack!
Flavor Name: Healthy Trail Mix, Size: 1.2 Ounce (Pack of 24)
A great snack, low sugar. A great substitute for sugary granola or sugary healthy bars. Fresh contents with great protein. Great for hiking, camping, biking, workout and a plethora of other things!
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Reviewed in the United States on April 7, 2026
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Timbo
San Leandro, US
★★★★★ 5
Great Snacks
Flavor Name: Healthy Trail Mix, Size: 1.2 Ounce (Pack of 24)
We love these snacks. They’re fresh, tasty, nutritious, and satisfying. The little packets are easy to carry in your pocket, purse or just keep them in your desk drawer. Very handy for a quick pick-me-up.
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Reviewed in the United States on May 6, 2026
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Amazon Customer
Lowell, US
★★★★★ 5
Tasty, fresh, and great for on-the-go snacking
Flavor Name: Healthy Trail Mix, Size: 1.2 Ounce (Pack of 24)
I really enjoyed this trail mix snack pack. The portions are convenient, the mix tastes fresh, and it is a great option for a quick snack at work, while traveling, or anytime I need something easy to grab. I like that it has a good variety and is both filling and satisfying. I would definitely buy it again.
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Reviewed in the United States on March 27, 2026
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Annie f
Lexington, US
★★★★★ 4
Healthy Snack
Flavor Name: Healthy Trail Mix, Size: 1.2 Ounce (Pack of 24)
Nice size snack and it is nutritious. The dried fruit and nuts are delicious.
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Reviewed in the United States on March 19, 2026

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