Vontron ULP21‑2540 RO Membrane – Ultra‑Low Pressure 2.5″×40″ The Vontron ULP21‑2540 RO Membrane is part of the ULP (Ultra‑Low Pressure) series by Vontron. This RO membrane is built for low‑TDS and municipal water applications, delivering reliable filtration with reduced operating pressure. Specifically, the ULP21‑2540 offers ~750 GPD (~2.8 m³/day) nominal permeate flow and ~99% stable salt rejection in a compact 2.5″×40″ (2540) size. It’s ideal for applications where space is limited or where energy and pump cost reduction is required. Key Features Ultra‑low pressure operation — works at roughly 2/3 the pressure of standard low‑pressure membranes. Capacity: ~750 GPD and ~99% salt rejection under test conditions. Compact size: 2.5″ diameter × 40″ length fits smaller vessels and retrofit systems. Designed for feedwater TDS < 2000 ppm (surface, underground, municipal). Durable design: Max operating pressure ~600 psi (~4.14 MPa) and feed temperature max ~45 °C. Technical Specifications Parameter Value Model ULP21‑2540 Active Membrane Area ~30 ft² (~2.8 m²) Rated Permeate Flow ~750 GPD (~2.8 m³/day) Stable Salt Rejection Rate ~99.0% Maximum Operating Pressure ~600 psi (~4.14 MPa) Maximum Feed Temperature ~45 °C Maximum SDI ≤ 5 pH Range (Operation) 3 – 10 pH Range (Cleaning) 2 – 12 Max Free Chlorine in Feed < 0.1 ppm Why Choose the Vontron ULP21‑2540 RO Membrane? If you’re looking for a compact membrane that offers strong performance with lower system pressure and energy cost, the Vontron ULP21‑2540 fits the bill. Because the element is designed for municipal or low‑salinity sources, you avoid the expense of higher‑pressure systems and oversized equipment. Moreover, its standard 2.5″×40″ size makes it easy to integrate into smaller or retrofit RO vessels. Installation & Maintenance Tips Ensure proper pre‑treatment: feed water should meet SDI ≤ 5 and free chlorine < 0.1 ppm. On first use, flush the new membrane: 15‑25 minutes at low pressure, then 60‑90 minutes at full pressure; discard the first hour of permeate. Vontron Türkiye Monitor permeate flow and salt rejection; a drop may indicate fouling or membrane damage. Clean according to manufacturer guidelines; always stay within pH and temperature limits. Store spare membranes wet or in preservative solution (for example, 1% sodium bisulfite) when not in use.
