ESPA2 MAX Reverse Osmosis Membrane – Low Energy, High Productivity Brackish Water Element

Maximize productivity and minimize energy use with the Hydranautics ESPA2 MAX, a premium 8" x 40" low-energy reverse osmosis membrane from the ESPA (Energy Saving Polyamide) series. Featuring an expanded active membrane area, this MAX variant delivers higher permeate flow while maintaining excellent salt rejection at remarkably low operating pressures — ideal for cost-effective brackish water treatment.

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) — increased packing density for greater output
• 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: Spiral Wound Membrane Polymer: Composite Polyamide Dimensions: 8" diameter x 40" length (includes brine seal, interconnector, and O-rings)

Standout Features

• Energy Efficient Operation: Performs optimally at low feed pressures, significantly reducing pumping costs and overall system energy consumption.
• High Productivity MAX Design: Larger active area allows higher flow rates in the same standard element size — reducing the number of pressure vessels and floor space needed, which lowers capital costs.
• Reliable Rejection & Durability: Provides consistently low permeate TDS with robust performance across variable brackish feeds.
• Operating 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 production and wastewater reclamation
• Industrial process water and boiler feed systems
• Commercial RO installations focused on energy savings
• Large-scale plants seeking high output with lower operating pressures
• Any brackish water system where cost efficiency and high productivity are priorities

Trusted Quality from Hydranautics

Each ESPA2 MAX element is carefully packaged in a sealed polyethylene bag with sodium meta-bisulfite preservative, ensuring it arrives in optimal condition for long-term, reliable service in demanding applications.

Price: Competitive pricing through KnappRO Chicago (inquire for volume discounts or current stock).

The ESPA2 MAX combines low-energy performance with maximum productivity — delivering pure water more efficiently than standard elements. Perfect upgrade for systems looking to boost output while cutting energy bills.

Add to your cart today or contact us for expert advice on membrane selection, system design, or compatibility with your existing setup.

KnappRO Chicago — Premium Hydranautics RO membranes at affordable prices with dedicated support.