Nanofiltration
DOW FILMTEC NF270 membrane elements are ideal for removing a high percentage of TOC and THM precursors with medium to high salt passage and medium hardness passage. NF270 is an ideal choice for surface water and ground water where good organic removal is desired with partial softening.
DOW FILMTEC NF90 membrane elements provide high productivity performance while removing a high percentage of salts, nitrate, iron and organic compounds such as pesticides, herbicides and THM precursors.
DOW FilmTec Nanofiltration Membrane Elements
- NF90 Nanofiltration elements offer nanofiltration technology that selectively removes these components, color and operates at low operating pressures
- NF270 Nanofiltration elements offer organic removal with partial softening in order to maintain a minimum level of hardness for organoleptic properties and preservation of distribution networks
DOW FilmTec 2.5×40 Nanofiltration Membrane Elements
| Model | FilmTec Part No. | Permeate Flow Rate | Active Area | Applied Pressure | Nominal Size(Dia.×L) | Stabilized Salt Rejection | |
| NF270-2540 | 149986 | 850 gpd | (3.2 m3/d) | 28 ft2(2.6 m2) | 70 psig (4.8 bar) | 2.5″×40″ | >97.0% |
| NF90-2540 | 149982 | 680 gpd | (2.6 m3/d) | not published | 70 psig (4.8 bar) | 2.5″×40″ | >97.0% |
Permeate Flow and salt rejection based on test conditions: 2,000 ppm MgSO4, 77°F (25°C) and 15% recovery at the pressure specified above. Flows for individual elements may vary by -20%/+30%. Developmental products available for sale.
DOW FilmTec 4×40 Nanofiltration Membrane Elements
| Model | FilmTec Part No. | Permeate Flow Rate | Active Area | Applied Pressure | Nominal Size (Dia.×L) | Stabilized Salt Rejection | |
| NF270-4040 | 149987 | 2,500 gpd | (9.5 m3/d) | 82 ft2(7.6 m2) | 70 psig (4.8 bar) | 4″×40″ | >97.0% |
| NF90-4040 | 149983 | 2,000 gpd | (7.6 m3/d) | not published | 70 psig (4.8 bar) | 4″×40″ | >97.0% |
Permeate Flow and salt rejection based on test conditions: 2,000 ppm MgSO4, 77°F (25°C) and 15% recovery at the pressure specified above. Flows for individual elements may vary by -15%/+50%. Developmental products available for sale.
DOW FilmTec 8-Inch Nanofiltration Membrane Elements
| Model | Permeate Flow Rate | Active Area | Feed Spacer | Nominal Size (Dia.×L) | Stabilized Salt Rejection | Minium Salt Rejection | |
| NF270-400/34i | 12,500 gpd | (47 m3/d) | 400 ft2(37 m2) | 34 mil LDP | 8″×40″ | >97.0% | 97.0% |
| NF90-400/34i | 10,000 gpd | (38 m3/d) | 400 ft2(37 m2) | 34 mil LDP | 8″×40″ | >97.0% | 98.7% |
Permeate Flow and salt rejection based on test conditions: 2,000 ppm MgSO4, 77°F (25°C) and 15% recovery at the pressure specified above. Flows for individual elements may vary by +/-15%. Stabilized rejection is generally achieved within 24-48 hours of continuous use; depending upon feedwater characteristics and operating conditions. active area guaranteed +/- 3%.
Benefits of DOW FilmTec Nanofiltration Elements
- Good Organic (NOM) Removal
- Partial Softening Preserves Water Character
- Reduced Power Consumption and Costs
- Long Element Life
- Delivers high productivity due to high active area
- High cleanability due to wide cleaning pH range (1 – 12) tolerance
- FilmTec Performance and Quality
- 8″ Elements feature iLEC™ interlocking end caps, reducing system operating costs and the risk of o-ring leaks that can cause poor water quality
DOW FilmTec Nanofiltration Element Features
- High Flux Results in High Yields
- High Rejection Results in Excellent Water Quality
- Consistent Quality from Automated Rolling
- FilmTec Performance and Quality
Applications for DOW FilmTec NF Elements
- Production of Municipal Drinking Water
- Commercial Water Demineralization
- Water Reuse
- Surface Water
- Ground Water
Discontinued DOW FilmTec Nanofiltration Elements
The DOW FilmTec 8-inch Nanofiltration Elements have been discontinued and replaced with the iLEC interlocking end-cap models. These will fit in existing installations, without the need for interconnectors between elements in multi-element housings. (Additional information on interlocking endcap elements can be found in the literature section on this page.) The below specifications are for reference only.
| Discontinued Model | Replaced by Model | Endcap Style | Active Area | Nominal Size (Dia.×L) | Stabilized Salt Rejection | |
| Original | Replacement | |||||
| NF270-400 | NF270-400/34i | Standard | iLEC | 400 ft2 (37 m2) | 8″×40″ | >97.0% |
| NF90-400 | NF90-400/34i | Standard | iLEC | 400 ft2 (37 m2) | 8″×40″ | >97.0% |