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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Tim
Cuba, US
★★★★★ 5
good, worth the value
Size: Medium, Color: (025) Castlerock / Castlerock / Anthracite
Well it was delivered quick, and all my socks are mostly under armour, as they have developed holes in the heels now, so here i am getting a new set. they fit great, comfortable as usual. some folks may have some sort of issues, while some dont and i cannot complain. worth buying for sure. i recommend
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Reviewed in the United States on April 22, 2025
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Miki
Houston, US
★★★★★ 5
Kids?
Size: Medium, Color: (025) Castlerock / Castlerock / Anthracite
I didn’t realize these were kids socks, until after I got them, but the fit is amazing and they stay put, without coming off my heels. I wear an 8.5-9 in women’s shoes.
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Reviewed in the United States on March 8, 2026
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Lexi
Boise, US
★★★★★ 5
Good, Comfortable Fit
Size: Medium, Color: (100) White / White / Black, Number of Items: 6, Size: Medium, Color: (100) White / White / Black, Number of Items: 6
I wear a women’s size 9.5 and I got a size Medium. They fit perfect, they aren’t super heavy, but have cushion where needed. Perfect for my steel toe boots
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Reviewed in the United States on May 28, 2026
A
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Amazon Customer
Grantham, US
★★★★★ 5
Son loves them!
Size: Large, Color: Black (6-pairs), Number of Items: 6
My son loves these socks! Comfy, good quality.
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Reviewed in the United States on May 20, 2026
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Tori M
Louisville, US
★★★★★ 5
Good fabric
Size: Medium, Color: White, Number of Items: 6
Nice socks. Would buy again.
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Reviewed in the United States on March 23, 2026

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