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Dow Filmtec LE-440i Reverse Osmosis (RO) Membrane

12,650 GPD industrial / commercial low energy replacement reverse osmosis (RO) membrane element

The Filmtec LE-440i element is a low-energy element featuring the highest active membrane area in the industry. It enables high productivity and low energy operation, while maintaining high-rejection performance, minimizing operating expense and lowering the total cost of water for industrial and municipal applications.

  • Delivers the same permeate flow at an equivalent operating flux at 40% lower feed pressure, compared to the Filmtec BW30-440i element.
  • Offers permeate flow rate 10 percent higher while producing similar permeate quality than that of the Filmtec LE-400 element, enabling the lowest total cost of water in high-purity industrial applications.
  • Includes iLEC interlocking endcaps, which reduce system operating costs and the risk of o-ring leaks that cause poor water quality.
  • Designed using an industry standard 1.125 inch ID permeate tube for interchangeability with other brackish water elements.
Membrane Type:Polyamide Thin-Film Composite (TFC)
Maximum Operating Temperature:113F (45C)
Maximum Operating Pressure:600 psi (41 bar)
Maximum Pressure Drop:15 psi (1.0 bar)
Maximum Feed Flow Rate:85 gpm (19 m3/hr)
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:12,650 GPD (48 m3/day)*
Stabilized Salt Rejection:99.3%
Filmtec LE-440i Reverse Osmosis (RO) Membrane

*Permeate flow and salt rejection based on the following standard conditions: 2,000 ppm NaCl, 150 psi (10.3 bar), 77F (25C), pH 8 and 15% recovery. For comparison, the LE-440i will have a permeate flow of 13,400 gpd (51 m3/d) and stabilized salt rejection of 99.3% when normalized to a feed solution of 1,500 ppm NaCl as used by some manufacturers. Flow rates for individual elements may vary but will be no more than 15% below the value shown.

**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 +/-3%. 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" (29mm)
Filmtec LE-440i Size Chart

Individual elements with iLEC endcaps measure 40.5 inches (1,029 mm) in length (B). The net length (A) of the elements when connected is 40.0 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 LE-440i
Our Stock #703246670
Dow Part #246670
8.0 40 440 (41) 150 psi 12,650 (48)

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.

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