XLE-2521

Summary

Product Identification

FilmTec™ XLE-2521 is an extra low energy reverse osmosis (RO) membrane element designed for small commercial systems purifying less than one gallon per minute (0.2 m³/d) of RO water. These elements operate at low pressure to reduce energy costs and allow for the use of lower cost system components.

• Part Number: 154530
• Membrane Type: Polyamide Thin-Film Composite

Typical Properties

Performance is based on the following test conditions for XLE elements: 500 ppm NaCl feed stream, 77°F (25°C), and 8% recovery.

• Applied Pressure: 100 psig (6.9 bar)
• Permeate Flow Rate: 365 gpd (1.38 m³/d)
  • Note: Permeate flows for individual elements may vary ±20%.
• Stabilized Salt Rejection: 99.0%

Mechanical / Hydraulic

Element Dimensions (XLE-2521)

• Maximum Feed Flow Rate: 6 gpm (1.4 m³/h)
• Dimension A: 21.0 inches (533 mm)
• Dimension B: 1.19 inches (30 mm)
• Dimension C: 0.75 inches (19 mm)
• Dimension D: 2.4 inches (61 mm)
• Pressure Vessel Compatibility: Fits nominal 2.5 inch I.D. pressure vessels.

Operating Limits

• Maximum Operating Temperature: 113°F (45°C)
  • Note: Maximum temperature for continuous operation above pH 10 is 95°F (35°C).
• Maximum Operating Pressure: 600 psig (41 bar)
• Maximum Pressure Drop:
  • Across an element: 13 psig (0.9 bar)
  • Across an entire pressure vessel (housing): 30 psi (2.1 bar)

Feed Water

• pH Range:
  • Continuous Operation: 2 - 11
  • Short-Term Cleaning (30 min.): 1 - 13
• Maximum Feed Silt Density Index (SDI): 5
• Free Chlorine Tolerance: <0.1 ppm
  • Note: The presence of free chlorine and other oxidizing agents may cause premature membrane failure. DuPont Water Solutions recommends removing residual free chlorine by pretreatment.

Operational Guidance

• Start-up:
  • Avoid abrupt pressure or cross-flow variations.
  • Feed pressure should be increased gradually over 30-60 seconds.
  • Cross-flow velocity should be achieved gradually over 15-20 seconds.
• Keep elements moist at all times after initial wetting.
• To prevent biological growth during prolonged system shutdowns, immerse membrane elements in a preservative solution.
• The customer is responsible for the effects of incompatible chemicals and lubricants on elements.
• Avoid static permeate-side backpressure at all times.

Customer Notice

• The use of this product does not necessarily guarantee the removal of cysts and pathogens from water. Effective reduction depends on the complete system design, operation, and maintenance.
• Permeate obtained from the first hour of operation should be discarded.

---

Disclaimer: This summary is based on the provided text extract and may miss figures, footnotes, or revisions present in the complete OEM PDF datasheet. Contractual data must match the OEM PDF revision used on the project.

Official datasheet (PDF)

PDF datasheet