SoftPlus Water Softeners Iron Rival Iron Reduction Systems ecoTAC Hard Water Conditioning Systems

Dow Filmtec SW30ULE-400i Reverse Osmosis (RO) Membrane

replacement 11,000 GPD seawater desalination reverse osmosis (RO) membrane element

Sorry, this item has been discontinued by the manufacturer.
Please call our certified water technicians toll free at 1-866-376-2690 to discuss potential alternative products.

The Filmtec SW30ULE-400i is an element with one of the highest flow rates in the industry, and highest rejection of NaCl and boron. This performance can lead to significant capital and operation cost savings, especially when this element is mixed with other element types in the same pressure vessel, using the internally staged design approach. The benefits of the Filmtec SW30ULE-400i elements include:

  • One of the highest seawater element flow rate in the industry. This may lead to lower capital and operation cost in a seawater system.
  • High NaCl and Boron rejection to help meet World Health Organization (WHO) and other drinking water standards.
  • Effective use in permeate staged seawater desalination systems without impairing the performance of the downstream stage.
  • High performance over the operating lifetime without the use of oxidative post-treatments.
  • Automated, precision fabrication with a greater number of shorter membrane leaves reduces the effect of overall fouling and maximizes element efficiency.
Membrane Type:Polyamide Thin-Film Composite (TFC)
Maximum Operating Temperature:113F (45C)
Maximum Operating Pressure:1,200 psi (83 bar)
Maximum Pressure Drop:13 psi (0.9 bar)
pH Range, Continuous Operation:2-11***
pH Range, Short-Term Cleaning:1-13* (30min)
Maximum Feed Silt Density Index:5 SDI
Free Chlorine Tolerance:<0.1 ppm**
Permeate Flow Rate:11,000 GPD (41.6 m3/day)*
Stabilized Salt Rejection:99.7%
Minimum Salt Rejection:99.55%
Stabilized Boron Rejection:87%
Feed Spacer:28 mil
Filmtec SW30ULE-400i Reverse Osmosis (RO) Membrane

*The above benchmark values are based on the following test conditions: 32,000 ppm NaCl, 800 psi (5.5 MPa), 77F (25C), pH 8 and 8% recovery. Permeate flows for individual elements may vary +/-15%.

**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.

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

Note: Active surface area guaranteed +/-5%. Active area as stated by FilmTec is not comparable to nominal membrane area often stated by some manufacturers.


   A: 40.0" (1,016mm)
   B: 40.5" (1,029mm)
   C: 7.9" (201mm)
   D: 1.125"ID (29mm)
Filmtec SW30ULE-400i Size Chart

Element fits nominal 8-inch (203 mm) I.D. pressure vessels. Individual iLEC elements measure 40.5 inches (1,029 mm) in length (B). The net length (A) of iLEC elements when connected is 40 inches (1,016 mm).

Model Diameter Inches Length Inches Active Surface
Area ft2 (m2)
Test Pressure Permeate Flow
GPD (m3/day)
(w/ Free Shipping)
Filmtec SW30ULE-400i
Our Stock #703259124
Dow Part #259124
8 40 400 (37) 800 psi 11,000 () Sorry, this item has been discontinued by the manufacturer. Please call our certified water technicians toll free at 1-866-376-2690 to discuss potential alternative products.

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.

Customer Questions & Answers

No customer questions have been submitted for this. Have a question? Ask it above.