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Purification Customized


industrial reverse osmosis systems


how the world gets purified water

Hydranautics ESPAB MAX Membrane

Product Description


Industrial users worldwide have made ESPA their first choice for high productivity and salt rejection. ESPAB MAX is one of the best in energy-saving polyamide membranes. It has increased active surface area for higher flux and rejection, with the same superior boron rejection as the ESPAB. The growing family of ESPA (Energy-Saving Polyamide) RO membranes continue to meet the ever-increasing demands of the water treatment industry.


ESPAB MAX Specifications:

  • Permeate Flow: 9,000 gpd (34.1 m3/d)
  • Salt Rejection: 99.3% (99.0% minimum)
  • Boron Rejection (Typical)@ pH=10: 96.0 
  • Configuration: Spiral Wound
  • Membrane Polymer: Composite Polyamide

Membrane Active Area: 440ft2 (40.8m2)
The stated performance is initial (data taken after 30 minutes of operation), based on the following conditions:

  • 1500 PPM NaCl solution
  • 150 psi (1.05 MPa) Applied Pressure
  • 77ºF (25ºC) Operating Temperature
  • 15% Permeate Recovery
  • 6.5 - 7.0 pH Range
  • (For boron testing, 10 mg/L boron is added and pH adjusted to 10 with NaOH)

Standard Operating Limits:

  • Maximum Applied Pressure: 600 psig (4.16 MPa)
  • Maximum Chlorine Concentration: < 0.1 PPM
  • Maximum Operating Temperature: 113ºF (45ºC)
  • pH Range, Continuous (Cleaning): 2-11 (1-12.5)*
  • Maximum Feedwater Turbidity: 1.0 NTU
  • Maximum Feedwater SDI (15 mins): 5.0
  • Maximum Feed Flow: 75 GPM (17.0m3/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.


Ideal Applications Include:

  • Municipal Potable and Wastewater Plants
  • Bottling Operations
  • Light industrial
[custom-documents]Hydranautics ESPAB MAX Membrane [/custom-documents]
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