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50 GPD Dow Filmtec RO Membrane

The Dow FILMTEC Residential Membrane elements are specifically designed to provide your home with safe, clean cooking water and drinking water. This Polyamide (TFC) Thin Film Composite, standard 2″ diameter elements have been tested and Certified by NSF International against NSF/ANSI Standard 58 for material requirements only.

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  • 50 Gallon Per Day
  • Advanced Membrane Technology w/ Automated Fabrication
  • Consistent Performance
  • NSF/ANSI Standard 58 listed
  • Fits most standard 2″ housings
  • Membrane Life: 2-5 years

DOW FILMTEC™ Membranes
Next Generation of Residential Reverse Osmosis Elements

DOW FILMTEC™ reverse osmosis (RO) membranes for home drinking water treatment units are
some of the most reliable and consistent elements in the industry. Advanced membrane technology and automated fabrication allow Dow to precisely produce each and every element to tight, pre-defined specifications. Dow’s advanced and consistent RO element quality helps customers develop, and maintain brand recognition along with a reputation for building systems that reliably provide low-impurity drinking water. DOW FILMTEC™ elements 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.

Product Specifications:

Applied Pressure Permeate Flow Rate Stabilized Salt
Product Part Number psig (bar) gpd (l/h) Rejection (%)
TW30-1812-24 339140 50 (3.4) 24 (3.8) 98
TW30-1812-36 338470 50 (3.4) 36 (5.7) 98
TW30-1812-50 339138 50 (3.4) 50 (7.9) 98
TW30-1812-75 339146 50 (3.4) 75 (12) 98
  1. Permeate flow and salt rejection based on the following test conditions: 250 ppm softened tap water, 77°F (25°C), 15% recovery, and the specified applied pressure.
  2. The minimum salt rejection is 96.0%.
  3. Permeate flows for individual elements may vary +/-20%.

Figure 1

Dimensions – Inches (mm) A B C D E
TW30-1812 11.74 (298) 1.17 (30) 0.68 (17) 1.75 (44.5) 9.4 (239)

1. TW30-1812 Home Drinking Water elements fit nominal 2-inch I.D. pressure vessels

Operating Limits

Membrane Type Polyamide Thin-Film Composite
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 Operations 2–11
Maximum Feed Silt Density Index (SDI) 5
Free Chlorine Tolerance < 0.1 ppm

a. Maximum temperature for continuous operation above pH 10 is 95oF (35oC).

b. 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 pre-treatment prior to membrane exposure. Please refer to technical bulletin 609-22010 for more information.


DOW FILMTEC™ Membranes
Next Generation of Residential Reverse Osmosis Elements
Influence of Temperature and Pressure on TW30-1812 Permeate Flow

Important Information:

  • It is recommended that systems using these elements rinse the elements for 24 hours, prior to first use, to meet NSF/ANSI 58 Standards.
  • The first full tank of permeate must be discarded. Do not use this initial permeate for drinking water or food preparation.
  • Keep elements moist at all times after initial wetting.
  • To prevent biological growth during prolonged system shutdowns, it is recommended that membrane elements be immersed in a preservative solution. Rinse out the preservative before use.
  • The membrane shows some resistance to short-term attack by chlorine (hypocrite). Continuous exposure, however, may damage the membrane and should be avoided.
  • DOW FILMTEC™ Home Drinking Water Reverse Osmosis Elements may be covered under the DOW FILMTEC™ Reverse Osmosis and Nanofiltration Element Three-Year Prorated Limited Warranty, 609-35010-1006 extended to O Ems. Such Limited Warranty is non-transferable. Contact a Dow representative for more information.

If operating limits and guidelines given in this Product Information Bulletin are not strictly followed, the Limited Warranty will be null and void. The O EM is fully responsible for the effects of incompatible chemicals and lubricants on elements. Use of any such chemicals or lubricants will void the Limited Warranty.


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