Hydranautics ESNA1-LF2-LD-4040 Membrane

Product Description

ESNA1-LF2-LD-4040 are high performance nanofiltration membranes ideal for softening applications and the removal of pesticides, bacteria or viruses. They provide 50%-90% salt rejection with ultra-low-pressure operations, increased energy savings, and significantly lower installation and operating costs.

ESNA1-LF2-LD-4040 Specifications
  • Permeate Flow: 2,000 gpd (7.6 m3/d)
  • CaCl2 Rejection: 86%
  • CaCl2 Rejection (minimum/maximum): 83%/94%

*Expected calcium rejection for a typical 500 ppm well water is 96% at 13 gfd operating flux and 25°C.

  • Configuration: Low Fouling Spiral Wound
  • Membrane Polymer: Composite Polyamide
  • Membrane Active Area: 80ft2 (7.43m2)
  • Feed Spacer: 34 mil (0.864 mm) with biostatic agent

The stated performance is initial (data taken after 30 minutes of operation), based on the following conditions:

  • 500 ppm CaCl2
  • 75psi (0.52 MPa) Applied Pressure
  • 77°F (25°C) Operating Temperature
  • 15% Permeate Recovery
  • 6.5 – 7.0 Feed pH
Standard Operating Limits:
  • Maximum Applied Pressure: 600 psig (4.16 MPa)
  • Maximum Chlorine Concentration: < 0.1 PPM
  • Maximum Operating Temperature: 113°F (45°C)
  • pH Range, Continuous (Cleaning): 2-10 (1-12)
  • Maximum Feedwater Turbidity: 1.0 NTU
  • Maximum Feedwater SDI (15 mins): 5.0
  • Maximum Feed Flow: 16 GPM (3.6 m3/h)
  • Minimum Ratio of Concentrate to Permeate Flow for any Element: 5:1
  • Maximum Pressure Drop for Each Element: 10 psi

The limitations shown here are for general use. For specific projects, operating at more conservative values may ensure the best performance and longest life of the membrane. See Hydranautics Technical Bulletins for more detail on operation limits, cleaning pH, and cleaning temperatures.



  • Softening applications
  • Removal of pesticides, bacteria, or viruses
  • Municipal water treatment


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(1 review) Write a Review
  • 5
    Service was exceptional

    Posted by Carlos O. on Apr 10th 2020

    Excellent product!

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