4040 BW Superflow Membrane




4040 Industrial RO Membrane

This world-class 4040 industrial ro membrane delivers high permeate flows and salt rejection at lower raw water pressures, compared to regular low-pressure membrane elements.  Suitable for brackish and bore water, however, a higher silt density index may require additional treatment.  It operates under approximately 2 thirds of the operating pressure of a regular low-pressure composite membrane and achieves a salt rejection rate of up to 98.0%.  The lower energy requirement decreases the equipment cost in particular pump rating and pressure rating of the membrane housing.

Active Membrane Area ft2(m2) Average Permeate GPD(m3/d) Stable Rejection Rate % Min. Rejection Rate %
90 (8.4) 2400 (9.1) 99.0 98.5




4040 Industrial Membrane Housing


  • Testing Pressure……. 150 psi (1.03Mpa)
  • Testing Solution Temperature……. 25 ℃
  • The concentration of Testing Solution (NaCl)……. 1500ppm
  • pH value of Testing Solution……. 7.5
  • Recovery Rate of Single Element……. 15%


  • Max. Working Pressure……. 600psi(4.14Mpa)
  • Max. Volume of Feedwater…… 16gpm(3.6 m3/h)
  • Max. Temperature of Feed-water……. 45℃
  • Max. Feed-water SDI15……. 5
  • pH Range of Feed Water during Continuous Operation……. 3~10
  • pH Range of Feed Water during Chemical Cleaning……. 2~12
  • Residual Chlorine Concentration of Feed Water……. <0.1ppm
  • Max. Pressure Drop of Single Reverse Osmosis Membrane Element……. 15psi(0.1Mpa)
  • Max. Pressure Drop of Single Pressure Vessel with Six RO Membranes……. 50psi(0.34Mpa)

Specification ULP11-4040

  • Stable Rejection Rate: 98.0%
  • Minimum Rejection Rate: 97.5%
  • Average Permeated Flow: 2,800 gpd (9.1 m3/d)
  • Active Membrane Area: 85 ft2
  • Size: 4″ x 40 “

Operating Conditions

  • Max.Working Pressure: 600 psi
  • Max.Feedwater Flow: 16 GPM (3.6 m3/h)
  • Max. Feedwater Temperature: 45C
  • Max. Feedwater SDI: 5
  • Residual chlorine Concentration of Feed Water: <0.1ppm
  • pH Range of Feedwater during Continuous Operation: 3~1
  • pH Range of Feedwater during Chemical Cleaning: 2~12
  • Max. Pressure Drop of Single Membrane Element: 10psi( 68 kPa)

Commercial Applications

  • Drinking water for restaurants
  • Drinking water vending machines
  • Aquarium water treatment
  • Softened water for homes, hotels, commercial laundries, and car wash.
  • Post-treatment of deionized water
  • Pure water for pharmaceuticals, laboratories, and electronics
  • Hemodialysis
  • Oil/water separation
  • Spot free rinse – window and solar panel cleaning
  • Sterilizers and autoclaves ( additional Deionising stage may be required)

Additional information


4040 BW Superflow, 4040 2000 GPD Vontron ULP, 4040 2000 GPD Filmtec BW 30 4040, 4040 Vontron Mempro, RO Membrane TW – 4040 HF, Vontron ULP11-4040 3000GPD Membrane, Vontron XLP11-4040, Vontron SW4040HR, 4040 2000 GPD Vontron LP


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