Hydranautics CPA7-LD Membrane

Product Description

CPA7-LD is the sixth generation CPA high rejection brackish water RO membrane and has the highest salt rejection at 99.8%.

CPA7-LD membranes use a patented 34 mil thickness feed spacer that increases effectiveness of membrane cleaning.

As a result, the CPA7-LD membrane does not need to be cleaned frequently – thus reducing treatment cost – while offering extreme durability and consistent performance.

Where high purity water is required under difficult conditions, CPA7-LD membrane provides the best combination of best permeate quality and lower feed pressure in brackish water RO membranes.

CPA7-LD membrane is useful in power generation, electronics, semiconductor, pharmaceutical and food & beverage industries.


CPA7-LD Specifications:
  • Permeate Flow: 11,500 gpd (43.5 m3/d)
  • Salt Rejection: 99.8% (99.7% minimum)
  • Configuration: Low Fouling Spiral Wound
  • Membrane Polymer: Composite Polyamide
  • Membrane Active Area: 400 ft2 (37.2 m2)
  • Feed Spacer: 34 mil (0.864 mm)

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



Standard Operating Limits:
  • Maximum Applied Pressure: 600 psig (4.14 MPa)
  • Maximum Chlorine Concentration: < 0.1 ppm
  • Maximum Operating Temperature: 113 °F (45 °C)
  • pH Range, Continuous (Cleaning): 2–11 (1–13)
  • Maximum Feedwater Turbidity: 1.0 NTU
  • Maximum Feedwater SDI (15 mins.): 5.0
  • Maximum Feed Flow: 75 gpm (17.0 m3/h)
  • Maximum Pressure Drop for Each Element: 15 psi



  • Municipal/Industrial Surface and Wastewaters
  • Difficult Feedwaters Requiring Significant Pretreatment


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(1 review) Write a Review
  • 5
    Top seller

    Posted by Paco M. on Apr 10th 2020

    They compete in price

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