ESPA2-LD MAX Reverse Osmosis Membrane – Low Energy, Low Fouling, High Productivity

Combine the best of low-energy performance, fouling resistance, and maximum output with the Hydranautics ESPA2-LD MAX. This premium 8" x 40" RO membrane features expanded active area, LD Technology for reduced fouling, and exceptional energy efficiency — making it ideal for large-scale brackish water systems demanding high productivity at lower pressures.

Key Specifications & Performance

• Permeate Flow: 12,000 gallons per day (45.4 m³/day)
• Salt Rejection: 99.6% (99.5% minimum)
• Active Membrane Area: 440 ft² (40.9 m²) — MAX design for higher throughput
• Feed Spacer: Optimized for low differential pressure and fouling resistance
• Test Conditions: 1,500 ppm NaCl, 150 psig (1.03 MPa) applied pressure, 77°F (25°C), 15% recovery, pH 6.5–7.0

Configuration: Low Fouling Spiral Wound Membrane Polymer: Composite Polyamide Dimensions: 8" diameter x 40" length (includes brine seal, interconnector, and O-rings)

Key Benefits

• MAX Productivity: Larger active membrane area allows higher permeate flow or fewer elements/vessels, reducing capital costs and system footprint.
• LD Low-Fouling Technology: Minimizes colloidal and biological fouling for longer operating cycles, fewer cleanings, and extended membrane life.
• Energy Efficient: Low-pressure operation cuts pumping costs significantly while maintaining strong rejection.
• Robust Limits:
  • Max Applied Pressure: 600 psig (4.14 MPa)
  • Max Operating Temperature: 113°F (45°C)
  • pH Range (Continuous / Cleaning): 2–10.6 (1–12)
  • Max Feedwater Turbidity: 1.0 NTU
  • Max Feedwater SDI (15 min): 5.0
  • Max Feed Flow: 75 gpm (17.0 m³/h)
  • Max Pressure Drop per Element: 15 psi
  • Chlorine Tolerance: < 0.1 ppm

Ideal Applications

• Municipal drinking water and wastewater reclamation plants
• Industrial process water and boiler feed systems
• Large commercial RO installations focused on energy savings and high output
• Systems with variable or challenging brackish feeds requiring fouling resistance
• Any application benefiting from lower operating pressures and reduced maintenance

Premium Quality & Packaging

Supplied in protective polyethylene packaging with sodium meta-bisulfite solution, ready for reliable long-term performance in continuous-duty systems.

Price: Competitive at KnappRO Chicago (contact for quotes on volume or system packages).

The ESPA2-LD MAX delivers the ultimate balance of high rejection, maximum flow, low energy use, and fouling resistance — a top-tier choice for efficient, high-volume brackish water treatment.

Questions about integrating this into your array or comparing it to other ESPA/CPA models? Let us know — we're happy to help optimize your setup.

KnappRO Chicago — Quality Hydranautics RO membranes, affordable pricing, and dedicated support for your water treatment success.