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Hydranautics Membrane

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Hydranautics CPA2-4040 RO Membrane


Permeate Flow: 2,250 gpd (8.5m3/d)

Salt Rejection : 99.5% (99.2% minimum)

Configuration: Spiral Wound

Membrane Polymer: Composite Polyamide

Membrane Active Area: 85ft2 (7.9m2)

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

1500 PPM NaCl solution

225 psi (1.55 MPa) Applied Pressure

77°F (25°C) Operating Temperature

15% Permeate Recovery

6.5 – 7.0 pH Range

  • 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.

Hydranautics ESPA2-LD-4040 RO Membrane


Model Name: ESPA2-LD-4040 Length: 40″ Diameter: 4″ Weight: 8 lbs 34 mil feed spacer Active Membrane: 80 ft2 Membrane Type: Low Fouling Thin Film Composite Operating Pressure: 150 PSI Maximum Pressure: 600 PSI Permeate Flow Rate: 2000 GPD Nominal Salt Rejection: 99. 6%

Product Information




Up to 99. 6% Nominal Rejection Lower pressure For lower CAPEX/OPEX High Productivity Longer Membrane Life due to Low Biological and Colloidal Fouling Higher rejection For impurities including Silica and Boron Greater Tolerance to High pH Cleaning


Maximum Operating Temperature: 113F (45C) Chlorine Tolerance: 0. 1 PPM pH Range, Continuous Operation: 2-10. 6 pH Range, Short Term Cleaning (30min): 1-12 Maximum Feed Water Turbidity (NTU): 1 Maximum Feed Water Silt Density Index (SDI): 5 Maximum Pressure Drop For Each Element: 10 psi Maximum Feed Flow: 16 GPM