Unlock maximum energy savings with the Hydranautics ESPA4-LD, an advanced 8" x 40" low-pressure RO membrane from the ESPA series. Optimized for very low feed pressures and featuring LD (Low Differential) fouling-resistant technology, this element is perfect for brackish water applications where minimizing operating costs and extending cleaning intervals are priorities. Key Specifications & Performance Permeate Flow: 12,000 gallons per day (45.4 m³/day) Salt Rejection: 99.2% (99.0% minimum) Active Membrane Area: 400 ft² (37.2 m²) Feed Spacer: 34 mil (0.86 mm) — promotes low fouling Test Conditions: 500 ppm NaCl, 100 psig (0.7 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) Standout Advantages Ultra-Low Pressure Operation: Performs at just 100 psi test pressure — one of the lowest in the lineup, drastically cutting energy use for pumps and overall system costs. LD Fouling Resistance: Wider feed spacer and specialized design reduce colloidal and biofouling, leading to longer run times between cleanings and lower maintenance. High Productivity at Low TDS: Excellent for treating lower-salinity brackish water with reliable rejection and high flow. 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: 85 gpm (19.3 m³/h) Max Pressure Drop per Element: 15 psi Chlorine Tolerance: < 0.1 ppm Ideal Applications Municipal and industrial brackish water desalination with energy constraints Low-TDS well water treatment for drinking or process use Wastewater reclamation and reuse systems Commercial RO plants seeking lowest possible operating pressures Installations with conventional pretreatment needing strong anti-fouling performance Reliable & Ready-to-Use Each element is packaged in a sealed polyethylene bag with sodium meta-bisulfite preservative for optimal shelf life and immediate performance upon installation. Price: Competitive through KnappRO Chicago (inquire for volume pricing or current availability). The ESPA4-LD represents the pinnacle of low-energy RO technology — delivering high output with minimal power input and reduced fouling risk. A smart choice for sustainable, cost-effective water treatment. Need help selecting the right ESPA model for your system or comparing it to others in the lineup? We're here to assist. KnappRO Chicago — Quality Hydranautics membranes, affordable prices, and expert guidance.
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