Hydranautics SWC-4021 Seawater Reverse Osmosis Membrane Element
Hydranautics composite-polyamide spiral-wound elements deliver proven, reliable performance for seawater desalination and high-salinity water. The SWC-4021 is manufactured by Hydranautics, a Nitto Group company and a global leader in RO, NF and UF membranes.
📄 Download the Hydranautics Datasheet (PDF)
Performance Specifications
| Specification | Value |
|---|---|
| Manufacturer | Hydranautics (a Nitto Group Company) |
| Series | SWC |
| Element Size | 4" x 21" |
| Configuration | Spiral Wound |
| Membrane Polymer | Composite Polyamide |
| Active Membrane Area | 28.6 ft2 |
| Permeate Flow Rate | 640 gpd (2.4 m3/d) |
| Salt / Nominal Rejection | 99.4 % |
| Minimum Rejection | 99.0% minimum |
| Shipping Weight | ~7 lbs (boxed) |
| Shipping Dimensions | 6" × 25" × 6" (boxed W × L × D) |
| HS Code (Tariff) | 8421.21.0000 — water filtering/purifying apparatus |
Operating & Limiting Conditions
| Parameter | Limit |
|---|---|
| Maximum Applied Pressure | 1,000 psig (6.9 MPa) |
| Maximum Operating Temperature | 113 F (45 C) |
| Maximum Feed SDI | 4.0 |
| Free Chlorine Tolerance | < 0.1 PPM |
| pH Range — Operating | 2-11 |
| pH Range — Cleaning | 1-13 |
| Maximum Pressure Drop | 10 psi |
Physical Dimensions
| Dimension | Value |
|---|---|
| Overall Length | 21.0 (533.4) |
| Diameter | 3.95 (100.3) |
| Permeate Tube | 0.75 (19.1) |
| Fits Pressure Vessel | nominal 4-inch I.D. |
Performance based on Hydranautics standard test conditions: 32000 PPM NaCl solution, 800 psi (5.5 MPa) Applied Pressure, 77 F (25 C) Operating Temperature, 10% Permeate Recovery, 6.5 - 7.0 pH Range (Data taken after 30 minutes of operation). Individual element flow may vary ±15%. Reference: official Hydranautics (membranes.com) datasheet.
Typical Applications
- Seawater reverse osmosis (SWRO) desalination
- Marine and offshore watermakers
- High-salinity industrial feed water
- High-recovery SWRO trains
Frequently Asked Questions
What is the Hydranautics SWC-4021?
A 4" x 21" seawater reverse osmosis membrane element from Hydranautics, producing up to 640 gpd (2.4 m3/d) at 99.4 % rejection.
What is the rated flow and rejection?
Up to 640 gpd (2.4 m3/d) at 99.4 %, at standard test conditions (32000 PPM NaCl solution, 800 psi (5.5 MPa) Applied Pressure, 77 F (25 C) Operating Temperature, 10% Permeate Recovery, 6.5 - 7.0 pH Range (Data taken after 30 minutes of operation)).
What pressure vessel does it fit?
A nominal 4-inch I.D. RO pressure vessel.
What is the price of the SWC-4021?
Contact ForeverPure at 408-969-2688 or sales@foreverpureplace.com for current pricing and availability.
