The ULP21-4021 Reverse Osmosis Membrane is designed to deliver high-quality permeate water while operating at significantly reduced feed pressures. Built using advanced thin-film composite (TFC) membrane technology, this ultra-low-pressure RO element provides excellent rejection of dissolved salts, total dissolved solids (TDS), and other common water contaminants.
Manufactured in the compact 4.0" × 21" (4021) format, the ULP21-4021 is ideal for space-efficient commercial reverse osmosis systems where energy efficiency and consistent water quality are critical. Its ultra-low-pressure design allows systems to achieve target flow rates at lower pump pressures, reducing power consumption and extending equipment life.
The ULP21-4021 membrane is commonly used in commercial RO systems, equipment feed water applications, spot-free rinse systems, and light industrial processes. High salt rejection ensures reliable permeate quality, while durable construction supports long service life when paired with proper pretreatment, such as sediment and carbon filtration.
For operators seeking a compact, efficient, and dependable reverse osmosis membrane, the ULP21-4021 offers an optimal balance of performance, energy savings, and long-term reliability.
ULP21-4021 Ultra-Low Pressure Reverse Osmosis Membrane
Model
ULP21-4021
Membrane Type
Reverse Osmosis (RO)
Technology
Thin Film Composite (TFC)
Element Size
4.0" x 21" (4021)
Nominal Flow Rate
~1,000 GPD (typical)
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, Compact RO Systems
