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Article : ECOPRO440

DOW Filmtec™ ECO PRO-440 Membrane Element

Dow Filmtec™ ECO PRO-440 is a high performance membrane element.
It is best choice for obtaining the highest quality permeate. Dow Filmtec™ ECO PRO-440 used in existing systems and in new ones, where capital investments and productivity are important.

Key advantages

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

  • Characterized by high salt retention at low pressure

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

  • Effective washing in a wide range of pH (1-13), reliability and long service life

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, pH 8, 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.