BW30-4040 FilmTec DOW / DuPont 225 PSI 2,400 GPD 4 inch x 40 inch Membranes
PLEASE REFERENCE DATA SHEETS & TABLE BELOW
🏢 FilmTec BW30-4040 Brackish Water RO Membrane
The FilmTec BW30-4040 is an industry-standard 4-inch reverse osmosis element designed for the purification of brackish water in commercial and light industrial applications. It is widely recognized for its consistent performance and reliability, making it a staple in systems producing high-quality water for drinking, food and beverage processing, and industrial rinse water. As part of the BW30 series, this element is built to withstand high-volume usage while delivering excellent permeate quality and durability over a long service life.
Constructed with a polyamide thin-film composite membrane and a robust fiberglass hard-shell exterior, the BW30-4040 is engineered to handle a variety of feedwater sources. It features a spiral-wound design that optimizes surface area and provides a nominal salt rejection of 99.5%. With a permeate flow rate of 2,400 gallons per day, this element offers a high-productivity solution for system operators looking to achieve superior water purity at standard operating pressures.
| SPECIFICATION |
DETAILS |
| Model Number |
BW30-4040 |
| Manufacturer |
FilmTec (DuPont) |
| Membrane Type |
Polyamide Thin-Film Composite |
| Element Dimensions |
4.0" Diameter x 40" Length |
| Permeate Flow Rate |
2,400 GPD (9.1 m³/d) |
| Stabilized Salt Rejection |
99.5% |
| Minimum Salt Rejection |
99.0% |
| Active Surface Area |
78 ft² (7.2 m²) |
| Test Pressure |
225 psi (15.5 bar) |
| Max Operating Pressure |
600 psig (41 bar) |
| Max Operating Temp |
113°F (45°C) |
| pH Range (Continuous) |
2 – 11 |
| pH Range (Cleaning) |
1 – 13 |
VIEW LARGER DATA SHEET BY RIGHT CLICKING A DATA SHEET AND SELECTING "Open Image in New Tab".



| PART NUMBER |
SIZE (INCHES) |
Test Pressure (psi) |
FLOW RATE GPD |
Stabilized Salt Rejection |
| BW30-4040 |
4.0 x 40 |
225 |
2400 |
99.50% |