The ULP21-4040 Reverse Osmosis Membrane is a high-efficiency, ultra-low-pressure RO element designed to deliver consistent water purification performance while reducing energy consumption and system operating costs. Built using advanced thin-film composite (TFC) membrane technology, the ULP21-4040 provides excellent rejection of dissolved salts, total dissolved solids (TDS), and other impurities commonly found in municipal and pretreated well water sources.
Engineered in a standard 4" x 40" (4040) configuration, this membrane is compatible with a wide range of commercial and light-industrial reverse osmosis systems. Its ultra-low-pressure design allows optimal performance at reduced feed pressures, helping minimize pump load, extend system component life, and improve overall system efficiency.
The ULP21-4040 membrane is ideal for applications where energy efficiency and stable permeate quality are critical, including commercial water treatment, equipment feed water, spot-free rinse systems, and process water purification. With high salt rejection and dependable flow characteristics, it delivers consistent results across varying operating conditions.
When installed with proper pretreatment and maintained according to recommended operating parameters, the ULP21-4040 offers long service life and reliable performance, making it a cost-effective solution for commercial RO installations requiring ultra-low-pressure operation without sacrificing water quality.
ULP21-4040 Reverse Osmosis Membrane – Ultra-Low Pressure RO Element
Model
ULP21-4040
Membrane Type
Reverse Osmosis (RO)
Technology
Thin Film Composite (TFC)
Element Size
4" x 40" (4040)
Nominal Flow Rate
2,100 GPD (approx.)
Salt Rejection
≥ 99% (typical)
Operating Pressure
Ultra-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
