The LP21-4040 Reverse Osmosis Membrane is designed to deliver reliable water purification performance in commercial and light-industrial reverse osmosis systems operating under standard feed pressures. Manufactured using advanced thin film composite (TFC) membrane technology, this low-pressure RO element effectively removes dissolved salts, total dissolved solids (TDS), and other common contaminants from municipal and pretreated water supplies.
Built in the industry-standard 4.0" × 40" (4040) configuration, the LP21-4040 is compatible with a wide range of commercial RO housings and skid-mounted systems. Its low-pressure design provides an optimal balance between energy efficiency and high permeate output, making it suitable for applications where ultra-low-pressure membranes are not required but consistent performance is essential.
The LP21-4040 membrane is commonly used in commercial water treatment systems, equipment feed water, spot-free rinse applications, food and beverage processing, and light industrial operations. High salt rejection ensures stable permeate quality, while robust membrane construction supports extended service life when paired with proper pretreatment, such as sediment and carbon filtration.
For system operators seeking dependable performance, cost efficiency, and broad system compatibility, the LP21-4040 offers a proven and versatile reverse osmosis solution.
LP21-4040 RO Membrane | Low-Pressure 4040 RO Element
Model
LP21-4040
Membrane Type
Reverse Osmosis (RO)
Technology
Thin Film Composite (TFC)
Element Size
4.0" × 40" (4040)
Nominal Flow Rate
~2,400 GPD (typical)
Salt Rejection
≥ 99% (typical)
Operating Pressure
Low Pressure
Max Operating Temperature
113°F (45°C)
Max Feed TDS
2,000 ppm
Operating pH Range
2 – 11
Cleaning pH Range
1 – 12
Chlorine Tolerance
< 0.1 ppm
Applications
Commercial RO, Light Industrial RO
