Hydranautics
ESPA-4021 Hydranautics Nitto Membranes
ESPA-4021 Hydranautics Nitto Membranes
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ESPA-4021 Hydranautics Nitto Membranes
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Call: 1 (760) 598-0189
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Email: hctivista@gmail.com
PLEASE REFERENCE TABLE BELOW
Hydranautics ESPA-4021 Energy Saving RO Membrane Element
The Hydranautics ESPA-4021 is a high-performance Reverse Osmosis (RO) membrane element designed for significant energy savings in commercial and light industrial applications. Part of the highly successful Energy Saving Polyamide (ESPA) series, this element provides exceptional salt rejection while operating at ultra-low pressures.
The 4-inch by 21-inch configuration is ideal for smaller systems, delivering a nominal permeate flow of 1,000 GPD at a low applied pressure of just 150 psi. This low-pressure requirement directly translates to lower energy consumption and reduced operational costs compared to standard brackish water RO membranes. The ESPA-4021 maintains high water quality, achieving a nominal salt rejection rate of 99.5% for brackish water sources.
Technical Specifications Summary
| SPECIFICATION | DETAILS |
| Model Number | ESPA-4021 |
| Manufacturer | Hydranautics (Nitto) |
| Membrane Type | Reverse Osmosis (RO), Energy Saving |
| Membrane Polymer | Composite Polyamide |
| Nominal Permeate Flow | 1,000 GPD (4.9 m3/d) |
| Nominal Rejection (NaCl) | 99.5% (Min 99.0%) |
| Test Conditions | 1,500 ppm NaCl, 150 psi, 77∘F |
| Active Area | 38ft2 (3.5 m2) |
| Element Size | 4.0 in D x 21 in L |
| Max Applied Pressure | 600 psi (4.14 MPa) |
| Max Operating Temp | 113∘F (45∘C) |
| Feed Spacer Thickness | 34 mil (0.86 mm) |
| Model # | Diameter x Length | GPD | Rejection | Typical Pressure |
| ESPA-4021 | 4.0 x 21 | 1,000 | 99.0% | 150 |
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Information Accuracy: We strive to ensure that all product descriptions, specification tables, testing data, and cross-reference information are accurate and up-to-date. However, this information is provided for general reference purposes only. We are not legally liable for typographical errors, omissions, or inaccuracies within product descriptions, tables, or equivalent-model recommendations.
Manufacturer Updates: Manufacturers frequently revise product designs, component materials, and technical specifications without prior notice. The official manufacturer's current data sheet strictly supersedes any physical dimensions, specifications, or visual representations presented on this page.
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