Hydranautics
ESPA-2540 Hydranautics / Nitto 600 GPD at 150 PSI 2.5 x 40 inch Membranes
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Hydranautics ESPA-2540 Reverse Osmosis Membrane
The Hydranautics ESPA-2540 is a highly efficient 2.5-inch by 40-inch commercial Reverse Osmosis (RO) element from the manufacturer's flagship Energy-Saving Polyamide (ESPA) series. Designed by Hydranautics (a Nitto Group Company), this low-energy membrane provides high performance for brackish water applications, including small industrial systems, water stores, and commercial pretreatment.
The ESPA-2540 is specifically engineered to operate at lower applied pressures compared to standard high-pressure membranes, thereby significantly reducing energy costs without compromising water quality. It achieves a high nominal salt rejection rate of 99.4% and delivers a robust permeate flow of 600 GPD when tested at just 150 PSI. This combination of high quality and energy efficiency makes the ESPA-2540 an ideal choice for reliable and cost-effective water purification.
Specifications Table
| Characteristic | Specification | Units / Notes |
| Manufacturer | Hydranautics (Nitto) | - |
| Model Number | ESPA-2540 | - |
| Product Type | Low-Energy Brackish RO | Energy-Saving Polyamide (ESPA) |
| Size (Dia. x Length) | 2.5 x 40 | Inch |
| Nominal Permeate Flow | 600 (2.27) | GPD (m3/d) |
| Nominal Salt Rejection | 99.4 | % |
| Minimum Salt Rejection | 99.2 | % |
| Active Membrane Area | 28 (2.6) | ft2(m2) |
| Membrane Polymer | Composite Polyamide | - |
| Max Applied Pressure | 600 (4.14) | PSI (MPa) |
| Test Pressure | 150 (1.05) | PSI (MPa) |
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