LOW4-4021

Summary

Product identification

• Model: LOW4-4021
• Description: Extra Low Energy, Excellent Productivity - Brackish Water Element

Specifications

• Configuration: Spiral Wound
• Membrane Polymer: Composite Polyamide
• Brine Spacer Material: Polypropylene

Performance

• Nominal Permeate Flow: 1025 gpd (3.88 m³/d)
• Nominal Salt Rejection: 99.0% (98.0% minimum)
• Nominal Membrane Area: 35 ft² (3.2 m²)

Test Conditions

Performance specifications are based on the following test conditions:

• NaCl Solution: 500 ppm
• Applied Pressure: 100 psi (6.9 bar)
• Operating Temperature: 77 °F (25 °C)
• Permeate Recovery: 10%
• pH Range (After 30 min of operation): 6.5 ÷ 7.0

Mechanical / hydraulic

• Total Length: 21.0 inches (533.4 mm)
• Diameter: 3.95 inches (100.3 mm)
• Connection Diameter: 0.75 inches (19.1 mm)
• Core Tube Extension Feed Side: 1.2 inches (30.5 mm)
• Core Tube Extension Concentrate Side: 1.2 inches (30.5 mm)
• Weight: 4 lbs (1.8 Kg)

Operating limits

• Maximum Operating Pressure:
  • Fiberglassed: 600 psi (41.4 bar)
  • Tape Wrapped: 300 psi (20.7 bar)
• Maximum Operating Temperature: 113 °F (45 °C)
• Maximum Pressure Drop: 10 psi (0.7 bar)
• Maximum Feed Flow: 12 gpm (45.4 lpm)
• Maximum Feed Chlorine Concentration: <0.1 ppm
• Maximum Feedwater SDI (15min): 5.0
• Maximum Feedwater Turbidity: 1.0 NTU
• Feedwater pH Range: 3.0 ÷ 10.0
• Minimum ratio of concentrate to permeate flow for any element: 5:1

Note: The limitations shown above are for general use. Values may be more conservative for specific projects to ensure the best performance and longest life of the membrane.

General notices and guidelines

• Minimum permeate flow for individual elements is 20 percent below listed flow.
• Elements are vacuum sealed in a polyethylene bag containing less than 1.0% sodium meta-bisulfite and 10% propylene glycol solution.
• Permeate obtained from the first hour of operation should be discarded.
• Avoid static permeate-side backpressure at all times.
• These membranes may be subject to drinking water application restrictions in some countries; please check the application status before use and sale.
• For element loading, use only glycerine to lubricate o-rings and brine seal.
• The customer is fully responsible for the effects of incompatible chemicals on elements. The presence of free chlorine and other oxidizing agents will cause membrane failure, and this damage is not covered under warranty.

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

Official datasheet (PDF)

PDF datasheet