Bumblebee Linens

Dow Filmtec LE-440 i

Dow Filmtec LE-440 i

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 iLECTM 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.

Product Type
Polyamide Thin-Film Composite

40 in x 7.9 in

Product Specifications

Flow Rate
Rejection (%)
(psig) (bar) (GPD) (m³/h)
12,650 48.0 99.3
  1. Permeate flow and salt rejection based on the following standard conditions: 2,000 ppm NaCl, 150 psi (10.3 bar), 77°F (25°C), pH 8 and 15% recovery.
  2. 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.
  3. Flow rates for individual elements may vary but will be no more than 15% below the value shown.
  4. Sales specifications may vary as design revisions take place.
  5. Active area guaranteed ± 3%. Active area as stated by FilmTec is not comparable to nominal membrane area often stated by some manufacturers. Measurement method described in Form No. 609-00434.

Operating and Cleaning Limits

Operating Temperature
Operating Pressure
Feed Flow
Pressure Drop
pH Range,
Continuous Operation
pH Range,
Short-Term Cleaning (30 min.)
Maximum Feed
Silt Density
Index (SDI)
113°F (45°C) 600 psig (41 bar) 85 gpm (19.0 m³/h) 15 psig (1.0 bar) 2 - 11 1 - 13 SDI 5 < 0.1 ppm

• Maximum temperature for continuous operation above pH 10 is 95°F (35°C).
• Refer to Cleaning Guidelines in specification sheet 609-23010.
• 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 FILMTEC recommends removing residual free chlorine by pretreatment prior to membrane exposure. Please refer to technical bulletin 609-22010 for more information.


Product Type