XLE-4021

Summary

Product identification

FilmTec™ Reverse Osmosis (RO) Elements are designed for small commercial systems purifying less than one gallon per minute (0.2 m³/d) of RO water. FilmTec™ XLE extra low energy elements operate at the lowest pressure in the industry, aiming for lower energy costs and enabling the use of lower cost components. These membranes are available in a variety of sizes to meet different space requirements, offering high quality water and reliable performance.

• Product: XLE-4021
• Part Number: 154540

Operating limits

• Membrane Type: Polyamide Thin-Film Composite
• Maximum Operating Temperature: 113°F (45°C)
• Maximum Operating Pressure: 600 psig (41 bar)
• Maximum Pressure Drop (per element): 13 psig (0.9 bar)
• pH Range (Continuous Operation): 2 - 11 (Maximum temperature for continuous operation above pH 10 is 95°F (35°C))
• pH Range (Short-Term Cleaning, 30 min.): 1 - 13
• Maximum Feed Silt Density Index (SDI): 5
• Free Chlorine Tolerance: <0.1 ppm (Oxidation damage is not covered under warranty; removal of residual free chlorine by pretreatment is recommended.)

Feed water

Test conditions for XLE-4021 performance are based on:

• Feed Stream: 500 ppm NaCl
• Temperature: 77°F (25°C)
• Recovery Rate: 8%

Product water

Permeate flow and salt rejection based on the test conditions mentioned above:

• Applied Pressure: 100 psig (6.9 bar)
• Permeate Flow Rate: 1,025 gpd (3.88 m³/d)
• Stabilized Salt Rejection: 99.0%
• Note: Permeate flows for individual elements may vary +/-20%.

Mechanical / hydraulic

• Pressure Vessel Compatibility: XLE-4021 Elements fit nominal 4 inch I.D. pressure vessels.
• Maximum pressure drop across an entire pressure vessel (housing): 30 psi (2.1 bar)

General Operation Guidelines

• Proper start-up of RO systems is essential to prepare membranes and prevent damage.
• Avoid abrupt pressure or cross-flow variations during start-up, shutdown, or cleaning.
• Feed pressure should be increased gradually over a 30-60 second timeframe.
• Cross-flow velocity at the set operating point should be achieved gradually over 15-20 seconds.
• Elements must be kept moist at all times after initial wetting.
• During prolonged system shutdowns, immerse membrane elements in a preservative solution to prevent biological growth.
• Customers are responsible for the effects of incompatible chemicals and lubricants on elements.
• Avoid static permeate-side backpressure at all times.
• The use of this product does not necessarily guarantee the removal of cysts and pathogens; effective reduction depends on complete system design, operation, and maintenance.
• Permeate obtained from the first hour of operation should be discarded.

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Disclaimer: This summary is based on extracted text and may not include all figures, footnotes, or the latest revisions. Contractual data must match the OEM PDF revision used on the project.

Official datasheet (PDF)

PDF datasheet