BW30-400 Brackish Water RO Membrane
The BW30-400 was the first 400 square foot membrane element on the market and remains the reference standard for high-rejection brackish water applications. With 10,500 GPD permeate flow, 99.5% stabilized salt rejection, and superior durability, this element delivers consistent performance in new installations and retrofits where capital cost and productivity matter.
Engineered for reliability and performance
Superior Manufacturing
Fully automated production ensures element-to-element consistency and year-over-year reliability that other membranes can't match
High Flow, High Rejection
Delivers 10,500 GPD at 99.5% salt rejection without sacrificing durability or requiring chlorination during manufacturing
Wide pH Cleaning Range
Clean from pH 1 to pH 13 without damaging the membrane, giving you more flexibility and longer service life than competitor elements
400 Sq Ft Active Area
True active area guaranteed within 3%, measured using Filmtec's documented method, not inflated nominal ratings
Retrofit Compatible
Standard 8"×40" configuration fits existing pressure vessels in commercial and industrial brackish water systems
Proven Track Record
More than a decade of field performance across thousands of installations worldwide in diverse water conditions
Performance data and ratings
Where this membrane fits
The Filmtec BW30-400 is designed for commercial and industrial reverse osmosis systems treating brackish water sources including well water, surface water, and municipal supplies with elevated TDS. Compatible with standard 8-inch pressure vessels rated for 40-inch elements. Ideal for applications requiring maximum permeate quality including food and beverage processing, pharmaceutical manufacturing, boiler feedwater pretreatment, and high-purity rinse water systems. This element is widely specified by OEMs and system integrators for new builds and as a retrofit upgrade for older systems using lower-performing membranes.
Filmtec's automated manufacturing and non-chlorinated process deliver membranes that perform as specified, clean more effectively, and last longer than alternatives. This is the element you specify when reliability matters.
