CSM RE2521-FE

Summary

Product identification

The RE2521-FEn is an enhanced fouling resistant reverse osmosis (RO) element designed for brackish water and wastewater reuse.

• Membrane Type: Thin-Film Composite
• Membrane Material: Polyamide (PA)
• Element Configuration: Spiral-Wound, FRP Wrapping

General Features:

• Permeate Flow Rate: 300 GPD (1.1 m³/day)
• Stabilized Salt Rejection: 99.7%
• Minimum Salt Rejection: 99.4%
• Effective Membrane Area: 12 ft² (1.1 m²)

Standard Test Conditions: The stated product performance is based on data taken after 30 minutes of operation at the following conditions:

• 2,000 mg/L NaCl solution
• 225 psig (1.5 MPa) applied pressure
• 15% recovery
• 77 °F (25 °C)
• pH 6.5–7.0

Packaging: All elements are vacuum sealed in a polyethylene bag containing 1.0% SBS (sodium bisulfite) solution and individually packaged in a cardboard box. Each membrane element comes with one brine seal, one interconnector (coupler), and four o-rings.

Operating limits

• Max. Pressure Drop / Element: 15 psi (0.1 MPa)
• Max. Operating Pressure: 600 psi (4.14 MPa)
• Max. Feed Flow Rate: 6 gpm (1.36 m³/hr)
• Min. Concentrate Flow Rate: 1 gpm (0.23 m³/hr)
• Max. Operating Temperature: 113 °F (45 °C)
• Operating pH Range: 2.0–11.0
• CIP pH Range: 1.0–13.0
• Max. Turbidity: 1.0 NTU
• Max. SDI (15 min): 5.0
• Max. Chlorine Concentration: < 0.1 mg/L

Feed water

Design Guidelines for Various Water Sources:

• Wastewater Conventional (SDI < 5): 8–12 gfd
• Wastewater Pretreated by UF/MF (SDI < 3): 10–14 gfd
• Seawater, Open Intake (SDI < 5): 7–10 gfd
• Seawater, Beach Well (SDI < 3): 8–12 gfd
• Surface Water (SDI < 5): 12–16 gfd
• Surface Water (SDI < 3): 13–17 gfd
• Well water (SDI < 3): 13–17 gfd
• RO permeate (SDI < 1): 21–30 gfd

Saturation Limits (Using Antiscalants):

• Langlier Saturation Index (LSI): <+1.5
• Stiff and Davis Saturation Index (SDSI): <+0.5
• CaSO₄: 230% saturation
• SrSO₄: 800% saturation
• BaSO₄: 6,000% saturation
• SiO₂: 100% saturation

Mechanical / hydraulic

Dimensions:

• Model Name: RE2521-FEn
• Length (A): 21.0 inch (534 mm)
• Diameter (B): 2.5 inch (64 mm)
• Inner Connector Length (C): 0.75 inch (19.1 mm)
• Permeate Tube Diameter (D): 1.1 inch (28 mm)
• Outer Brine Seal Diameter (E): 1.1 inch (28 mm)
• Part Number (Element): 40000305
• Part Number (Inter-connector): 40000223

All RE2521 elements fit nominal 2.5 inch (64 mm) I.D. pressure vessels.

General Handling Procedures:

• Elements in boxes must be kept dry at room temperature (7–32 °C; 40–95 °F) and not stored in direct sunlight. If the polyethylene bag is damaged, a new preservative solution (sodium bisulfite) must be added and air-tight sealed.
• Permeate from the first hour of operation should be discarded to flush out the preservative solution.
• Elements should be immersed in a preservative solution during storage, shipping, and system shutdowns to prevent biological growth and freezing. The standard storage solution contains 1% by weight sodium bisulfite or sodium metabisulfite (food grade). For short-term storage (one week or less), 1% by weight sodium metabisulfite solution is adequate.
• Keep elements moist at all times after initial wetting.
• Avoid excessive pressure and flow spikes.
• Only use chemicals compatible with the membrane elements and components.
• Permeate pressure must always be equal to or less than the feed/concentrate pressure. Damage caused by permeate back pressure voids the element limited warranty.

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Disclaimer: This summary is based on the provided text extraction. It may not include all figures, footnotes, or the latest revisions present in the official PDF datasheet. For contractual data, always refer to the specific OEM PDF revision used on your project.

Official datasheet (PDF)

PDF datasheet