Hydranautics ESPA2-LD Reverse Osmosis Membrane

Optimize energy efficiency and system performance with the Hydranautics ESPA2-LD, a high-performance 8" x 40" low-energy reverse osmosis membrane designed for brackish water treatment. Part of the renowned ESPA (Energy Saving Polyamide) series, this LD (Low Differential) variant excels in applications requiring lower operating pressures, reduced energy consumption, and superior fouling resistance.

Key Specifications & Performance

• Permeate Flow: 10,000 gallons per day (37.9 m³/day)
• Salt Rejection: 99.6% (99.5% minimum)
• Active Membrane Area: 400 ft² (37.2 m²)
• Feed Spacer: 34 mil (0.86 mm) — enhances low-fouling performance
• 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)

Why Choose the ESPA2-LD?

• Energy Savings: Operates effectively at significantly lower feed pressures (tested at just 150 psi), reducing pump energy costs and overall system expenses.
• Low Fouling LD Technology: Minimizes colloidal and biofouling with a wider feed spacer and optimized design — resulting in longer cleaning intervals, extended membrane life, and lower maintenance.
• Reliable Rejection: Delivers consistently low permeate TDS for high-quality output in variable brackish water conditions.
• Robust 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: 85 gpm (19.3 m³/h)
  • Max Pressure Drop per Element: 15 psi
  • Chlorine Tolerance: < 0.1 ppm

Ideal Applications

• Municipal water treatment and wastewater reclamation
• Commercial and industrial brackish water desalination
• Boiler feedwater and process water purification
• Systems with energy constraints or lower-pressure requirements
• Installations using conventional pretreatment where fouling resistance is critical
• Large-scale plants seeking cost-effective, high-efficiency RO performance

Premium Packaging & Reliability

Every ESPA2-LD element ships protected in a sealed polyethylene bag with sodium meta-bisulfite solution, ensuring it arrives ready for immediate, long-term reliable service.

Price: Competitive pricing at KnappRO Chicago (contact for current pricing, volume discounts, or system integration advice).

Perfect for energy-conscious operations looking to lower operating costs without sacrificing permeate quality or durability. The ESPA2-LD is a go-to choice for municipalities, industries, and commercial facilities worldwide.

Upgrade your RO system with the ESPA2-LD today — lower energy, lower fouling, higher efficiency. Reach out for help with membrane selection, array configuration, or compatibility questions.

KnappRO Chicago — Quality Hydranautics membranes, affordable prices, and expert water treatment support.