ESPA1-7 Reverse Osmosis Membrane – Ultra Low Energy, High Permeability Brackish Water Element

Achieve exceptional energy efficiency with the Hydranautics ESPA1-7, a high-productivity 8" x 40" low-pressure reverse osmosis membrane from the ESPA series. Designed for even lower feed pressures than the ESPA2 models, the ESPA1-7 offers higher permeability while delivering strong salt rejection — making it an outstanding choice for treating low-to-moderate TDS brackish water with minimal energy input.

Key Specifications & Performance

• Permeate Flow: 12,000 gallons per day (45.4 m³/day)
• Salt Rejection: 99.4% (99.2% minimum)
• Active Membrane Area: 400 ft² (37.2 m²)
• 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)

Why Choose the ESPA1-7?

• Ultra-Low Energy Operation: Requires the lowest feed pressures in the ESPA lineup, translating to substantial savings on pumping costs and overall system energy use.
• High Permeability: Higher water flux compared to higher-rejection models, ideal for applications prioritizing volume output and efficiency.
• Proven Reliability: Excellent performance on low-TDS brackish sources with consistent permeate quality.
• Robust Operating Limits:
  • Max Applied Pressure: 600 psig (4.14 MPa)
  • Max Operating Temperature: 113°F (45°C)
  • pH Range (Continuous / Cleaning): 2–10 (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 potable water production from low-TDS brackish wells
• Commercial and light industrial water treatment
• Wastewater reclamation and reuse systems
• Any RO setup where minimizing energy consumption is a top priority
• Polishing or primary treatment in facilities with lower-pressure infrastructure

Ready for Installation

Supplied in protective packaging with sodium meta-bisulfite solution to maintain element integrity until startup.

The ESPA1-7 is the go-to solution when you need maximum permeate production at the lowest possible pressures. Perfect for cost-conscious operations focused on efficiency.

Browse our full Hydranautics collection or contact us for recommendations on the best membrane for your specific feedwater and system design.

KnappRO Chicago — Quality membranes, affordable prices, expert support for your water treatment needs.

Quality membranes, affordable prices