Hydranautics
ESPA4-LD-4040 Hydranautics Nitto 2,350 GPD at 100 PSI 4 x 40 inch Membranes
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Hydranautics ESPA4-LD-4040 Extra Low Energy Brackish Water RO Membrane (2,500 GPD)
The Hydranautics ESPA4-LD-4040 (manufactured by a Nitto Group Company) is an ultra-low pressure, energy-saving reverse osmosis (RO) membrane designed to purify brackish water. Built with an advanced composite polyamide polymer, this 4-inch by 40-inch spiral-wound element features a special 34-mil low-differential (LD) feed spacer. This thicker spacer design minimizes colloidal fouling and extends the time between required cleanings, ensuring long-lasting performance in commercial and industrial water treatment systems.
Engineered for maximum energy efficiency, the ESPA4-LD-4040 delivers a high permeate flow rate of 2,350 gallons per day (GPD) with a nominal salt rejection of 99.2%. It operates at an exceptionally low test pressure of just 100 PSI, which drastically reduces the energy required by high-pressure booster pumps and saves on operational costs. Built to withstand demanding commercial use, it safely handles a maximum applied pressure of 600 PSI and continuous liquid temperatures up to 113°F (45°C).
| SPECIFICATION | DETAILS |
| Model Number | ESPA4-LD-4040 |
| Manufacturer | Hydranautics (Nitto) |
| Element Type | Energy Saving Polyamide RO Membrane |
| Membrane Technology | Composite Polyamide |
| Active Membrane Area | 80 ft² (7.4 m²) |
| Permeate Flow Rate | 2,350 GPD (8.90 m³/d) |
| Nominal Salt Rejection | 99.2% |
| Minimum Salt Rejection | 99.0% |
| Test Pressure | 100 PSI (0.7 MPa) |
| Max Applied Pressure | 600 PSI (4.14 MPa) |
| Max Feed Flow Rate | 16 GPM (3.6 m³/h) |
| Feed Spacer Thickness | 34 mil |
| Max Operating Temp | 113°F (45°C) |
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