Vontron Reverse Osmosis Membrane ULP21-2540

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ULP series of ultra-low pressure aromatic polyamide compound membrane element newly developed by Vontron Membrane Technology Co., Ltd. can work under ultra low pressure to reach as high permeate flow and rejection same as regular low-pressure membrane element, and is applicable to desalination of surface water and underground water.

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Vontron ULP21‑2540 RO Membrane – Ultra‑Low Pressure 2.5″×40″

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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.

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Key Features

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  • Ultra‑low pressure operation — works at roughly 2/3 the pressure of standard low‑pressure membranes.

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  • Capacity: ~750 GPD and ~99% salt rejection under test conditions.

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  • Compact size: 2.5″ diameter × 40″ length fits smaller vessels and retrofit systems.

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  • Designed for feedwater TDS < 2000 ppm (surface, underground, municipal).

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  • Durable design: Max operating pressure ~600 psi (~4.14 MPa) and feed temperature max ~45 °C.

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  • Technical Specifications

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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

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Why Choose the Vontron ULP21‑2540 RO Membrane?

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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.

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Installation & Maintenance Tips

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  1. Ensure proper pre‑treatment: feed water should meet SDI ≤ 5 and free chlorine < 0.1 ppm.

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  2. 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

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  3. Monitor permeate flow and salt rejection; a drop may indicate fouling or membrane damage.

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  4. Clean according to manufacturer guidelines; always stay within pH and temperature limits.

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  5. Store spare membranes wet or in preservative solution (for example, 1% sodium bisulfite) when not in use.

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Shipping policy

At our Company, we understand the importance of timely delivery. We offer a variety of shipping options to suit your needs, including standard, expedited, and express shipping. Our dedicated team works diligently to process and dispatch your orders promptly, aiming to deliver them to your doorstep within the estimated timeframe.

We strive to provide fast and reliable shipping to our customers. Here\\\’s everything you need to know about our shipping process:

  • Dispatch: Within 24 Hours
  • Free shipping across all products on a minimum purchase of $99.
  • International delivery time 5 to 7 business days
  • Cash on delivery might be available
  • Easy 30 days returns and exchanges

Please note that delivery times are estimates and may vary depending on factors such as product availability, destination, and carrier delay

Returns policy

We want you to be completely satisfied with your purchase from our website. If for any reason you are not entirely happy with your order, we\\\’re here to help. Certain exclusions and conditions may apply, so we encourage you to review our detailed return policy for more information. Rest assured, our goal is to ensure your complete satisfaction with every purchase you make from our website

  1. Returned items must be unused, undamaged, and in the same condition as received.
  2. Original tags, labels, and packaging must be intact and included with the returned item.
  3. Proof of purchase, such as your order confirmation or receipt, is required for all returns.

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