50 GPD | 1.8x12 | DOW FilmTec Home RO Membrane Membrane

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Brand DOW Filmtec
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Recommended Compatible Alternative: AMI Membranes are Made-In-USA with a large inventory in stock for immediate shipment & are competitively priced. AMI M-T1812A50 may be used as a direct replacement for TW30-1812-50HR home RO membrane.

DOW FilmTec Membrane Elements

DOW FILMTEC™  TW30-1812-50HR Home RO Membrane Element

DOW FILMTEC TW30-1812-50HR Elements for home drinking water treatment units produce 50 GPD (7.9 L/h) of permeate with 99% stabilized salt rejection at standard test conditions. They are shipped dry for convenient handling and long shelf-life. Dow’s next generation elements are a fully compatible replacement for existing DOW FILMTEC residential RO elements. DOW FILMTEC TW30-1812-50HR elements have been tested and certified by NSF International against NSF/ANSI Standard 58 for material requirements only for safe use in drinking water applications.  

DOW FILMTEC TW30-1812-50HR Elements is FDA – 21 CFR 177.2550; Food and Drug Administration Compliant.

Product Specifications


FilmTec Membranes are FDA Compliant    FilmTec Membranes are NSF Certified  Genuine DOW FilmTec Membrane Element   DOW FilmTec Home RO Membranes are Made in USA


Specifications for TW30-1812-50HR

FilmTec Part Number: TW30-1812-50
Size (Approximate): 1.8" Dia. x 12"L*
Flow Rate: 50 gpd  (7.9 lph)
Applied Pressure: 50 psig (3.4 bar)
Stabilized Salt Rejection: 99%
Membrane Type:
Polyamide Thin-Film

Permeate flow and salt rejection based:  500ppm NaHCO3, 77°F, 15% recovery, pH 8.0, and 50 psig.

Operating Limits for TW30-1812-50HR

Maximum Operating Temperature: 113°F (45°C)
Maximum Operating Pressure: 150 psig (10 bar)
Maximum Feed Flow Rate: 2.0 gpm (7.6 lpm)
pH Range, Continuous Operation*: 2-11
Maximum Feed Silt Density Index: 5
Fere Clorine Tolerance**: <0.1ppm

*Maximum temperature for continuous operation above pH 10 is 95°F
**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.

DOW FilmTec DuPont TW30-1812-50HR is a direct replacement for TW30-1812-50, which has been discontinued by the manufacturer.

Related Products for use with TW30-1812-50HR

H-R2068QC Flow Restrictor for 50 GPD Membranes
Membrane Housing for use with DOW FilmTec Home RO Membranes
F-4ME2QC Elbow Fitting for Home RO Membrane Housing

To change the daily production of your system, simply replace the membrane and the corresponding flow restrictor to the desired flow rate.

To use a FilmTec membrane in a system with a non-standard housing, simply replace membrane housing (and appropriate plumbing connections) with a standard housing.  

Benefits of DOW FilmTec Home RO Membranes

  • Reverse Osmosis water treatment removes up to 99% of total dissolved solids from water.
  • Shipped dry for long shelf life
  • FilmTec performance and quality
  • For ease of installation, element o-rings have been pre-lubricated with glycerin.

Applications for FilmTec Residential RO Membranes:

  • Under the sink water treatment
  • Point-of-use reverse water treatment systems
  • Production of home drinking water
  • Office
  • Aquariums 
  • Institutions 
  • Restaurants
  • Ice Makers
  • Labs
  • Point of Use RO System

Physical Dimensions of DOW FilmTec TW30-1812-50HR

DOW FilmTec Home RO Membrane Drawing  
A 11.74 (298)
B 0.875 (22.2)
C 0.68 (17)
D 1.75 (44.5)
E 9.4 (239)


TW30-1812 Home Drinking Water elements seal at a standard 2.0 inch – 2.05 inch I.D. within pressure vessels