Vontron Reverse Osmosis Membrane ULP21-4040
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 ULP21‑4040 RO Membrane – Ultra‑Low Pressure 4″×40″
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The Vontron ULP21‑4040 RO Membrane is part of Vontron’s ULP (Ultra–Low-Pressure) series, designed for surface water, underground water, or municipal feed with TDS < 2,000 ppm. This industrial-grade membrane offers high performance at significantly reduced pressure compared to standard low‑pressure membranes. The 4″ diameter × 40″ length format ensures compatibility with standard vessels, making it suited for commercial, light‑industrial, and large domestic RO systems.
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Key Features
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- Ultra‑low pressure operation, reducing pump and infrastructure costs.
- Stable salt rejection ~99% (minimum ~98.5%) under test conditions.
- Typical permeate flow ~2,400–2,600 GPD (~9–10 m³/day) in a standard 4040 element.
- Suitable feed water: TDS < 2,000 ppm NaCl equivalents.
- Compact “4040” size fits many existing RO systems for easier retrofits.
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Technical Specifications
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| Parameter | Value |
|---|---|
| Model | ULP21‑4040 |
| Active Membrane Area | ~90 ft² (~8.4 m²) |
| Rated Permeate Flow | ~2,400‑2,600 GPD (~9–10 m³/day) |
| Stable Rejection Rate | ~99% |
| Minimum Rejection Rate | ~98.5% |
| Max Feed Pressure | ~600 psi (~4.14 MPa) |
| Max Feed Flow | ~16 gpm (~3.6 m³/hr) |
| Max Feed Temperature | 45 °C |
| SDI (Silt Density Index) | ≤ 5 |
| Free Chlorine Tolerance | < 0.1 ppm |
| pH Range (Continuous Operation) | 3–10 |
| pH Range (Cleaning) | 2–12 |
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Why Choose the Vontron ULP21‑4040 RO Membrane?
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If you’re looking for a high‑capacity membrane with lower energy consumption, the ULP21‑4040 is an excellent choice. Because it runs at lower pressure while still delivering near‑99% salt rejection and good flow rates, you reduce operating cost and extend component life. Moreover, its standard 4″×40″ size means it works in many existing systems without major modifications — making it ideal for upgrades, commercial installations or demanding domestic setups.
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Installation & Maintenance Tips
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- Ensure proper pre‑treatment: feed water SDI ≤ 5, free chlorine < 0.1 ppm, and temperature under 45 °C.
- On first use, flush the new membrane: run ~15‑25 minutes at low pressure, then ~60‑90 minutes at full design pressure and discard initial permeate.
- Monitor key parameters: permeate flow, salt rejection, and differential pressure — a drop may indicate fouling or scaling.
- Clean according to manufacturer guidelines; observe pH and temperature limits.
- For storage, keep the membrane wet or in a 1% sodium bisulfite solution if not in immediate 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
- 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.
Vontron SW4040HR