Vontron Reverse Osmosis Membrane ULP31-4040
Vontron Reverse Osmosis Membrane ULP31-4040
Vontron ULP31‑4040 RO Membrane – Ultra‑Low Pressure 4″×40″
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.
Key Features of the Vontron ULP31‑4040 RO Membrane
- 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.
Technical Specifications
| 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″) |
Why Choose the Vontron ULP31‑4040 RO Membrane?
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.
Installation & Maintenance Tips
- 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.