FilmTec LC LE-4040 RO Membrane

DOW FilmTec LC LE-4040 Membrane Elements USA deliver high quality water at low pressure at harsh water conditions. The LC 4040 product range are available to meet a wide variety of customer needs in commercial applications, from producing high purity water to delivering low total system costs. Dow’s fully automated element production enables the most consistent products in the industry that minimizes the total cost of ownership of water treatment systems.

  • High rejection results in excellent water quality
  • Low energy usage reduces power consumption and costs
  • Durable with good cleanability for long element life
  • Filmtec Performance and quality


FilmTec Brackish Water Reverse Osmosis 4″ Membrane Elements

FilmTec Brackish Water Reverse Osmosis 4″ Elements can separate salts from water and are produced with an automated fabrication process that ensures precision, consistency, and reliability. They are ideal for use in medium-sized water treatment system that produce less than approximately 10 gpm (2300 L/h) of permeate. Our RO membranes build on a tradition of leadership in the thin-film composite membrane industry and meet the challenges of higher rejection in lower-pressure operations.

Operating Limits

  • Membrane type: Polyamide Thin-Film Composite
  • Maximum operating temperature: 113°F (45°C)
  • Maximum operating pressure: 600 psig (41 bar)
  • Maximum pressure drop: 15 psig (1.0 bar)
  • Maximum feed flow rate, gpm (m3/h): 16 gpm (3.6 (m3/h)
  • pH range, continuous operation: 2 – 11
  • pH range, short-term cleaning: 1 – 13
  • Maximum Feed Silt Density Index: SDI 5
  • Free chlorine concentration: < 0.1 ppm

General Information

Proper start-up of reverse osmosis water treatment systems is essential to prepare the membranes for operating service and to prevent membrane damage due to overfeeding or hydraulic shock. Following the proper start-up sequence also helps ensure that system operating parameters conform to design specifications so that system water quality and productivity goals can be achieved.

Before initiating system start-up procedures, membrane pretreatment, loading of the membrane elements, instrument calibration and other system checks should be completed.

Operation Guidelines

Avoid any abrupt pressure or cross-flow variations on the spiral elements during start-up, shutdown, cleaning or other sequences to prevent possible membrane damage. During start-up, a gradual change from a standstill to operating state is recommended as follows:

  • Feed pressure should be increased gradually over a 30-60 second time frame
  • Cross-flow velocity at set operating point should be achieved gradually over 15-20 seconds
  • Permeate obtained from first hour of operation should be discarded.

Important Information

  • Keep elements moist at all times after initial wetting
  • If operating limits and guidelines given in this Product Bulletin are not strictly followed, the limited warranty in Form No. 609-35010 will be null and void
  • To prevent biological growth during prolonged system shutdowns, it is recommended that membrane elements be immersed in a preservative solution
  • The customer is fully responsible for the effects of incompatible chemicals and lubricants on elements
  • Maximum pressure drop across an entire pressure vessel (housing) is 50 psi (3.4 bar)
  • Avoid static permeate-side backpressure at all times.


  • Commercial and Industrial water demineralization
  • Production of municipal drinking water
  • Power Generation
  • Food and Beverages
  • Agriculture and Farming


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