Filmtec (BW30-4040) Brackish Water Membrane 2,400 GPD 4"X40"
Industry-Standard Brackish Water RO Membrane
High-flow commercial reverse osmosis membrane element with 2,400 GPD capacity and 99.5% salt rejection for light industrial and commercial applications
The Filmtec BW30-4040 has been the commercial brackish water standard for decades because it delivers consistent performance where it matters most. With 78 square feet of active membrane area and the industry's thickest feed spacer at 34 mil, this element resists fouling better than thin-channel alternatives while maintaining high rejection rates across a wide range of feedwater conditions.
Performance Data
| Model Number | BW30-4040 |
| Dimensions | 4 inches × 40 inches |
| Active Surface Area | 78 ft² (7.2 m²) |
| Permeate Flow Rate | 2,400 GPD (9.1 m³/d) |
| Salt Rejection | 99.5% stabilized |
| Test Conditions | 2,000 ppm NaCl, 225 psig, 77°F, 15% recovery |
| Feed Spacer Thickness | 34 mil (thickest in industry) |
| Cleaning pH Range | pH 1–13 |
| Shell Type | Hard shell exterior |
| Flow Variance | ±20% per element |
What It Does Best
The BW30-4040 is engineered for brackish water applications where feedwater TDS ranges from 500 to 10,000 ppm. The 34 mil feed spacer creates wider channels that tolerate higher particulate loads and reduce pressure drop, which means longer run times between cleanings in real-world conditions. Hard shell construction makes this element ideal for multi-element vessels with three or more membranes, where pressure differentials can stress thinner housings. Use it in light industrial RO systems, commercial drinking water applications, boiler feedwater prep, and process water treatment where consistent permeate quality and predictable operating costs matter more than cutting corners on components.
System Requirements
Requires standard 4-inch diameter pressure vessels rated for at least 300 psi. Compatible with all standard 4040 membrane housings and multi-element configurations. Pair with 5-micron or finer sediment prefiltration to protect membrane surface. Feedwater should be pretreated to remove chlorine, iron, manganese, and hardness above saturation limits. Works with most commercial RO system controllers and monitoring equipment. Element fits Codeline, Pentair, Hydranautics, and other manufacturer vessels designed for 4-inch by 40-inch elements.
Industry-Standard Brackish Water RO Membrane
High-flow commercial reverse osmosis membrane element with 2,400 GPD capacity and 99.5% salt rejection for light industrial and commercial applications
The Filmtec BW30-4040 has been the commercial brackish water standard for decades because it delivers consistent performance where it matters most. With 78 square feet of active membrane area and the industry's thickest feed spacer at 34 mil, this element resists fouling better than thin-channel alternatives while maintaining high rejection rates across a wide range of feedwater conditions.
Performance Data
| Model Number | BW30-4040 |
| Dimensions | 4 inches × 40 inches |
| Active Surface Area | 78 ft² (7.2 m²) |
| Permeate Flow Rate | 2,400 GPD (9.1 m³/d) |
| Salt Rejection | 99.5% stabilized |
| Test Conditions | 2,000 ppm NaCl, 225 psig, 77°F, 15% recovery |
| Feed Spacer Thickness | 34 mil (thickest in industry) |
| Cleaning pH Range | pH 1–13 |
| Shell Type | Hard shell exterior |
| Flow Variance | ±20% per element |
What It Does Best
The BW30-4040 is engineered for brackish water applications where feedwater TDS ranges from 500 to 10,000 ppm. The 34 mil feed spacer creates wider channels that tolerate higher particulate loads and reduce pressure drop, which means longer run times between cleanings in real-world conditions. Hard shell construction makes this element ideal for multi-element vessels with three or more membranes, where pressure differentials can stress thinner housings. Use it in light industrial RO systems, commercial drinking water applications, boiler feedwater prep, and process water treatment where consistent permeate quality and predictable operating costs matter more than cutting corners on components.
System Requirements
Requires standard 4-inch diameter pressure vessels rated for at least 300 psi. Compatible with all standard 4040 membrane housings and multi-element configurations. Pair with 5-micron or finer sediment prefiltration to protect membrane surface. Feedwater should be pretreated to remove chlorine, iron, manganese, and hardness above saturation limits. Works with most commercial RO system controllers and monitoring equipment. Element fits Codeline, Pentair, Hydranautics, and other manufacturer vessels designed for 4-inch by 40-inch elements.
Original: $374.98
-65%$374.98
$131.24Description
Industry-Standard Brackish Water RO Membrane
High-flow commercial reverse osmosis membrane element with 2,400 GPD capacity and 99.5% salt rejection for light industrial and commercial applications
The Filmtec BW30-4040 has been the commercial brackish water standard for decades because it delivers consistent performance where it matters most. With 78 square feet of active membrane area and the industry's thickest feed spacer at 34 mil, this element resists fouling better than thin-channel alternatives while maintaining high rejection rates across a wide range of feedwater conditions.
Performance Data
| Model Number | BW30-4040 |
| Dimensions | 4 inches × 40 inches |
| Active Surface Area | 78 ft² (7.2 m²) |
| Permeate Flow Rate | 2,400 GPD (9.1 m³/d) |
| Salt Rejection | 99.5% stabilized |
| Test Conditions | 2,000 ppm NaCl, 225 psig, 77°F, 15% recovery |
| Feed Spacer Thickness | 34 mil (thickest in industry) |
| Cleaning pH Range | pH 1–13 |
| Shell Type | Hard shell exterior |
| Flow Variance | ±20% per element |
What It Does Best
The BW30-4040 is engineered for brackish water applications where feedwater TDS ranges from 500 to 10,000 ppm. The 34 mil feed spacer creates wider channels that tolerate higher particulate loads and reduce pressure drop, which means longer run times between cleanings in real-world conditions. Hard shell construction makes this element ideal for multi-element vessels with three or more membranes, where pressure differentials can stress thinner housings. Use it in light industrial RO systems, commercial drinking water applications, boiler feedwater prep, and process water treatment where consistent permeate quality and predictable operating costs matter more than cutting corners on components.
System Requirements
Requires standard 4-inch diameter pressure vessels rated for at least 300 psi. Compatible with all standard 4040 membrane housings and multi-element configurations. Pair with 5-micron or finer sediment prefiltration to protect membrane surface. Feedwater should be pretreated to remove chlorine, iron, manganese, and hardness above saturation limits. Works with most commercial RO system controllers and monitoring equipment. Element fits Codeline, Pentair, Hydranautics, and other manufacturer vessels designed for 4-inch by 40-inch elements.
