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Dow Filmtec TW30-1812 Series Residential
Reverse Osmosis (RO) Membranes

Filmtec TW30-1812 series RO membranes

replacement reverse osmosis membrane elements for home drinking water systems

The performance of reverse osmosis (RO) drinking water systems is directly related to the quality of the RO membrane installed in the system. DOW FILMTEC TW30 series reverse osmosis (RO) membranes are 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.

FILMTEC membranes are thin film composite membranes packed in a spiral wound configuration. Spiral wound designs offer many advantages compared to other module designs, such as tubular, plate and frame and hollow fiber module design for most of the reverse osmosis applications in water treatment. Typically, a spiral wound configuration offers significantly lower replacement costs, simpler plumbing systems, easier maintenance and greater design freedom than other configurations.

Dimensions - Inches (mm)

11.74 (298)
0.87 (22)
0.68 (17)
1.75 (44.5)
10.1 (254)

Filmtec TW30 Size Chart

TW30-1812 residential RO membrane elements fit most standard nominal 2-inch I.D. pressure vessels. Accordingly, TW30-1812 Series membranes will fit in most residential RO membrane housings, regardless of brand! Compare above-measurements to confirm.

Specifications & Operating Conditions:
Membrane Type:Polyamide Thin-Film Composite (TFC)
Maximum Operating Temperature:113F (45C)
Maximum Operating Pressure:150 psi (10 bar)
Maximum Feed Flow Rate:2.0 gpm (7.6 lpm)
pH Range, Continuous Operation:2-11*
Maximum Feed Silt Density Index (SDI):5
Free Chlorine Tolerance:< 0.1 ppm**

*Maximum temperature for continuous operation above pH 10 is 95F (35C).

**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. Most RO systems have carbon pre-filters for this purpose.

Important note about selecting the correct membrane capacity: All RO systems use a drain line flow restrictor to create pressure against the RO membrane. This pressure is critical to the performance of the RO system. If the drain line flow restrictor is not correctly matched to the capacity rating of the membrane, problems such as slow or ceased water production or high water waste can result. Select a replacement membrane that matches the capacity rating of your existing membrane and system. If you want to upgrade to a higher capacity membrane to increase the rate and quantity of daily water production, it is critical that you upgrade both the membrane AND the drain line flow restictor. Contact us for assistance.

Lowest Price Guaranteed

Best price guarantee on all Filmtec TW30-1812 Series membranes! If you find a lower advertised price, we will beat it by 5% of the difference - just call toll free 1-866-376-2690 - we won't be undersold!

Part # Model Dia x Length Test Pressure Capacity (GPD)* Rejection Rate** Price Each
60181225 Filmtec TW30-1812-24 2 x 12" 50 psi 24 98%

This membrane is no longer available (obsolete). The recommended replacement is the CSM RE1812-25.

60181235 Filmtec TW30-1812-36 2 x 12" 50 psi 36 98%

This membrane is no longer available (obsolete). The recommended replacement is the CSM RE1812-35.

60181250 Filmtec TW30-1812-50 2 x 12" 50 psi 50 98%
MSRP: US$53.10
Price: US$29.95
You save: $23.15

60181275 Filmtec TW30-1812-75

Filmtec BW60-1812-75
Recommended Replacement
2 x 12" 50 psi 75 98%
MSRP: US$56.05
Price: US$30.95
You save: $25.10

601812100 Filmtec TW30-1812-100 2 x 12" 50 psi 100 98%
MSRP: US$64.90
Price: US$35.95
You save: $28.95

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* Capacity (permeate flow) and salt rejection based on the following test conditions: 250 ppm softened tap water, 77F (25C), 15% recovery and the specified applied pressure. Capacity for individual elements may vary +/-20%.

** Minimum salt rejection is 96.0%.

Notice: The use of this product in and of itself does not necessarily guarantee the removal of cysts and pathogens from water. Effective cyst and pathogen reduction is dependent on the complete system design and on the operation and maintenance of the system.