DOW FILMTEC™ BW30-400 is an industrial brackish water RO membrane developed for high-quality water production in demanding water treatment applications. It combines high membrane surface area, high permeate flow, and excellent salt rejection, making it suitable for industrial RO plants, water purification systems, and membrane replacement projects.

• Designed for industrial RO applications
• High-quality permeate production
• 99.5% stabilized salt rejection
• 10,500 GPD typical permeate flow
• 400 ft² active area
• Durable polyamide TFC membrane
• Suitable for new and replacement RO systems
• Wide cleaning pH range of 1–13

membrane: Polyamide Thin-Film Composite

• Active Area: 400 ft² (37 m²)
• Feed Spacer: 28 mil
• Permeate Flow: 10,500 GPD (40 m³/day)
• Stabilized Salt Rejection: 99.5%
• Minimum Salt Rejection: 99.0%
• Length: 40.0 in (1,016 mm)
• Diameter: 7.9 in (201 mm)
• Permeate Tube: 1.125 in ID (29 mm)
• Test Feed: 2,000 ppm NaCl
• Test Pressure: 225 psi (15.5 bar)
• Test Temperature: 25°C
• Test pH: 8
• Test Recovery: 15%

These are the standard BW30-400 figures; don’t accidentally use the specifications of BW30-400/34 or the newer BW30 PRO-400/34, which are separate products.