For industrial and municipal water treatment facilities, achieving high-quality permeate while managing operating costs is a constant challenge. The Dow Filmtec NF90-400 Industrial Nanofiltration Equivalent represents the gold standard in nanofiltration technology, designed to deliver exceptional removal of specific contaminants while maintaining high productivity.
Purecowater supplies high-performance membrane elements that meet or exceed the rigorous specifications of industry-standard models like the NF90-400/34i. Whether you are targeting the removal of salts, nitrates, iron, or organic compounds, this membrane class is engineered for reliability in challenging water conditions.
What is the NF90-400 Nanofiltration Membrane?
The NF90-400 is an 8-inch spiral-wound nanofiltration element. Unlike Reverse Osmosis (RO) membranes that remove nearly all dissolved solids, the NF90 “tight” nanofiltration membrane is selective. It is specifically designed to remove a high percentage of Total Organic Carbon (TOC) and valuable salts while allowing some minerals to pass through, which can be advantageous for partial softening applications.
This membrane is particularly effective for removing:
- Pesticides and Herbicides: Essential for agricultural runoff treatment and drinking water safety.
- Organic Compounds: Reduces precursors for disinfection by-products (THMs).
- Heavy Metals and Salts: High rejection of nitrates, iron, and sulfates.
According to pureaqua.com, these membranes provide medium to high salt passage and medium hardness passage, making them ideal for groundwater and surface water treatment where total desalination is not required but contaminant removal is critical.
Key Features and Benefits
Investing in a high-quality NF90-400 equivalent ensures your system benefits from advanced membrane chemistry and specialized construction:
- High Active Area: With 400 square feet (37 m²) of active membrane area, this element maximizes productivity without increasing the system footprint.
- Fouling Resistance: The “34i” designation often refers to a 34-mil feed spacer. This thicker spacer reduces the pressure drop and minimizes fouling by allowing easier cleaning, especially in water sources with higher particulate loads xylem.com.
- Wide pH Cleaning Range: Capable of withstanding cleaning pH levels from 1 to 13, allowing for aggressive cleaning regimes to restore performance after fouling dupont.com.
- Energy Efficiency: Operates at lower pressures compared to standard RO membranes while delivering high contaminate rejection.
Technical Specifications
Below are the typical specifications for the NF90-400/34i style membrane elements supplied for industrial applications:
| Parameter | Specification |
|---|---|
| Membrane Type | Polyamide Thin-Film Composite |
| Permeate Flow Rate | 10,000 GPD (37.9 m³/d) |
| Stabilized Salt Rejection | > 97.0% |
| Active Membrane Area | 400 ft² (37 m²) |
| Feed Spacer Thickness | 34 mil |
| Maximum Operating Pressure | 600 psig (41 bar) |
| Maximum Operating Temperature | 113°F (45°C) |
Ideal Applications
The versatility of the NF90-400 makes it a preferred choice for a variety of sectors:
1. Industrial Water Demineralization
Facilities requiring partial demineralization to protect downstream equipment or meet specific process water standards rely on NF90 membranes to strip out harmful organics and salts.
2. Municipal Drinking Water
For municipalities treating surface water, these membranes excel at removing color (organics), reducing hardness, and eliminating micropollutants like pesticides without completely stripping the water of essential minerals.
3. Water Reuse
In wastewater reclamation projects, the NF90-400 acts as a critical barrier, ensuring that recycled water meets safety standards for irrigation or industrial reuse.
Why Choose Purecowater?
As a specialized distributor and OEM for top-tier filtration brands including Veolia, WTS, and LG membranes, Purecowater understands the nuances of liquid filtration. We help you identify the exact membrane replacement or equivalent that fits your system’s housing and performance requirements. Whether you strictly require the Dow FilmTec brand or a high-performance equivalent, our engineering expertise ensures your system operates at peak efficiency.
Need Filtration Support?
Whether you need a direct replacement for an NF90-400 element or a consultation on optimizing your filtration process, our team is ready to assist.