Reverse osmosis membranes

DOW FILMTEC LCLE-4040 Membrane Element

Artnumber: LCLE4040
Article: LCLE4040

The membrane element Dow Filmtec™ LCLE-4040 is intended for commercial use. The substitute for the production of high purity water and guarantees a low cost of the water treatment system. Dow Filmtec™ LC LE-4040 provides high quality permeate even with low quality inlet water and low pressure.

Key advantages

  • Dow Filmtec™ membrane (USA) is the world standard for water purification

  • Effective removal of silicon, nitrate and ammonium compounds

  • The high active surface area of ​​the element allows for greater productivity

  • Automated high-precision production makes it possible to obtain elements with a maximum active membrane area

Membrane type - spiral-wound element with polyamide thin-film composite

Active area, m2

Operating pressure, bar

Flow rate, m3/day

Stabilized salt rejection, %





  1. Permeate flow and salt (NaCl) rejection based on the following standard test conditions: 2.000 mg/L NaCl, 25°C, 15% recovery.

  2. Flow rates for individual elements may vary but will be no more than 15% below the value shown.

Operating limits

Maximum operating water temperature, °С


Maximum operating pressure, bar


Maximum element pressure drop, bar


pH range, continuous operation


pH range, short-term cleaning


Maximum Feed Silt Density Index (SDI)


Free chlorine tolerance

< 0.1

Before starting the reverse osmosis system the membrane must be pre-prepared, the elements loaded, the instruments calibrated and other system checks.
Avoid any spasmodic changes in pressure or flow within the roll elements during startup, shutdown, rinsing, etc. to avoid possible damage to the membrane. During startup it is recommended to gradually transfer the system from standstill to operational state as follows:

  • The inlet water pressure should be raised gradually within 30-60 seconds.

  • The operating flow rate should be achieved gradually over a period of 15-20 seconds.

  • Permeate obtained during the first hour of operation is discarded.

Important information

  • After starting wetting always keep the elements wet

  • To prevent biofouling during long breaks in work it is recommended to immerse the membrane elements in preservative solutions.

  • The maximum pressure drop is 2.1 bar.