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What Does “4040” Mean?
In the RO membrane industry, the four-digit naming convention directly corresponds to the physical dimensions of the element:
“40”: Represents a nominal outer diameter of 4.0 inches (approx. 101.6 mm).
“40”: Represents a nominal length of 40 inches (approx. 1016 mm).
Compared to smaller membrane elements like the 2540, the 4040 reverse osmosis membrane offers a larger effective membrane area and higher permeate output, allowing for a reduction in the number of elements and improved system operational efficiency. Compared to the 8040 element, it entails lower equipment investment and a smaller footprint, making it better suited for medium-scale water treatment systems.
Description
The 4040 reverse osmosis membrane utilizes advanced polyamide thin-film composite (TFC) technology, delivering high permeate flow, high salt rejection, and stable, long-lasting performance. It effectively removes dissolved salts, heavy metals, bacteria, viruses, organic matter, and other impurities, providing a continuous and reliable supply of high-quality purified water for various commercial and industrial water systems.
Performance Parameters
| Model | 4040 |
| Effective Membrane Area | 78 ft² (7.2 m²) |
| Average Permeate Flow | 2,200 GPD (8.3 m³/day) |
| Salt Rejection | 99.7% |
| Max. Inlet Water Temperature | 15°C |
| Max. Feed Water Flow | 14 GPM (3.2 m³/h) |
| Operating Pressure | 150 psi (1.03 MPa) |
| Max. Operating Pressure | 600 psi (4.2 MPa) |
| Max. Water Temperature | 45°C |
| Max. Feed Water SDI15 | 5 |
| Free Chlorine Concentration | < 0.1 mg/L |
| Continuous Operating pH Range | 3–10 |
| Chemical Cleaning pH Range | 2–11 |
| Max. Pressure Drop per Membrane Element | 15 psi (0.1 MPa) |
Applications
With its combined advantages of high efficiency, stability, durability, and cost-effectiveness, the 4040 reverse osmosis membrane has become one of the most widely used and reliable elements in commercial and light-industrial RO systems, providing users with long-term, stable, and high-quality water treatment solutions.
- Commercial Purified Water Systems
Centralized direct drinking water systems for schools, hospitals, office buildings, and hotels.
- Industrial Pure Water Preparation
Pre-treatment for ultra-pure water used in electronics/semiconductor rinsing, food and beverage formulation, and cosmetics manufacturing.
- Boiler Feedwater
Softening and desalination of boiler feedwater for power plants and chemical facilities to prevent scaling.
- Wastewater Reuse & Zero Liquid Discharge
Advanced treatment and reclamation of industrial effluent from electroplating, textile, and other heavy industries.