Vontron Reverse Osmosis Membrane ULP31-4040
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.
- Estimated Delivery : Up to 4 business days
- Free Shipping & Returns : On all orders over $200
Vontron ULP31‑4040 RO Membrane – Ultra‑Low Pressure 4″×40″
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The Vontron ULP31‑4040 RO Membrane is an ultra-low-pressure reverse osmosis element that delivers high performance in a compact format. With this Vontron RO Membrane, you get around 1,900 GPD (~7.2 m³/day) under ideal conditions, along with ~99% rejection, making it a strong choice for surface water, municipal, and low‑TDS applications. It operates at considerably lower pressure than standard membranes — thereby reducing infrastructure and energy costs. The 4″ × 40″ “4040” size ensures compatibility with common vessels and easier integration into existing RO systems.
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Key Features of the Vontron ULP31‑4040 RO Membrane
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- Ultra‑low-pressure design: works at approximately two‑thirds the pressure of standard membranes.
- Highly stable rejection (~99.4%) with a minimum of ~99.0% under test conditions.
- Rated average permeate ~1,900 GPD under testing conditions.
- Suitable for feedwater TDS up to ~2,000 ppm NaCl (municipal, surface, or borehole).
- Compact 4″ diameter × 40″ length fits standard RO vessels.
- Robust operating limits: Max pressure ~600 psi (4.14 MPa), max feed temperature ~45 °C, feed SDI ≤ 5.
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Technical Specifications
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| Parameter | Value |
|---|---|
| Model | ULP31‑4040 |
| Active Membrane Area | ≈ 90 ft² (≈8.4 m²) |
| Rated Permeate Flow | ~1,900 GPD (~7.2 m³/day) |
| Stable Rejection Rate | ≈ 99.4% |
| Minimum Rejection Rate | ≈ 99.0% |
| Maximum Operating Pressure | ~600 psi (~4.14 MPa) |
| Maximum Feed Temperature | 45 °C |
| Maximum Feed Flow | 16 gpm (~3.6 m³/h) |
| SDI (Silt Density Index) | ≤ 5 |
| Free Chlorine in Feed | < 0.1 ppm |
| pH Range (Continuous) | 3–10 |
| pH Range (Cleaning) | 2–12 |
| Physical Size | Length ~1016 mm, OD ~99.7 mm (3.9″) |
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Why Choose the Vontron ULP31‑4040 RO Membrane?
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Opting for the Vontron ULP31‑4040 RO Membrane means choosing a high‑efficiency membrane that delivers reliable water quality with reduced energy and infrastructure cost. It is ideal for customers requiring large throughput without high-pressure systems. Moreover, its compatibility with existing 4″×40″ housings makes retrofit simple, and its strong performance specs ensure long-term value in municipal or low‑TDS applications.
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Installation & Maintenance Tips
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- Ensure pre‑treatment: feedwater must meet SDI ≤ 5, free chlorine < 0.1 ppm, and temperature ≤ 45 °C.
- On first use, flush the new membrane: 15‑25 minutes at low pressure, followed by 60‑90 minutes at full pressure — discard the first hour of permeate.
- Monitor key indicators: gradually check permeate flow, conductivity, and differential pressure; any drop may signal fouling or scaling.
- Follow chemical cleaning protocols as specified by the manufacturer. Avoid excessive chlorine exposure and maintain pH within limits.
- For storage or standby, keep the membrane wet or in a protective solution (e.g., 1% sodium bisulfite) to prevent microbial growth.
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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
- Returned items must be unused, undamaged, and in the same condition as received.
- Original tags, labels, and packaging must be intact and included with the returned item.
- Proof of purchase, such as your order confirmation or receipt, is required for all returns.
