Description
DOW FILMTEC BW30-400 is a high-rejection, high-surface-area brackish water reverse osmosis membrane designed for industrial and commercial water treatment applications. The 8-inch × 40-inch spiral-wound element uses a polyamide thin-film composite membrane and provides high permeate flow with excellent salt rejection.
With 400 ft² (37 m²) active membrane area, a typical permeate flow of 10,500 GPD (40 m³/day), and 99.5% stabilized salt rejection, BW30-400 is suitable for new RO systems as well as replacement and retrofit applications.
- High salt rejection up to 99.5%
- High permeate flow of 10,500 GPD
- 400 ft² / 37 m² active membrane area
- Standard 8″ × 40″ industrial RO element
- Polyamide thin-film composite membrane
- Designed for brackish water applications
- Consistent element-to-element performance
- Suitable for new RO plants and retrofit systems
- Wide cleaning pH range of pH 1–13
- Reliable long-term operating performance
- 28 mil feed spacer design
Technical Specifications
| Specification | BW30-400 |
|---|---|
| Brand | DOW FILMTEC |
| Model | BW30-400 |
| Product Type | Brackish Water RO Membrane |
| Membrane Type | Polyamide Thin-Film Composite |
| Element Configuration | Spiral-Wound |
| Active Area | 400 ft² (37 m²) |
| Feed Spacer | 28 mil |
| Permeate Flow Rate | 10,500 GPD (40 m³/day) |
| Stabilized Salt Rejection | 99.5% |
| Minimum Salt Rejection | 99.0% |
| Element Length | 40.0 in (1,016 mm) |
| Element Diameter | 7.9 in (201 mm) |
| Permeate Tube ID | 1.125 in (29 mm) |
| Pressure Vessel | 8-inch nominal ID |
| Standard Test Feed | 2,000 ppm NaCl |
| Test Pressure | 225 psi (15.5 bar) |
| Test Temperature | 25°C (77°F) |
| Test pH | 8 |
| Test Recovery | 15% |
The published performance figures are based on the manufacturer’s standard test conditions, so actual plant performance can vary with feed-water quality, pressure, temperature, recovery, and pretreatment.







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