The BW-4040 4×40 RO Membrane is a white plastic reverse osmosis membrane designed for desalination of brackish water with 99.5% efficiency. It is compatible with Dow brand filters and specifically designed for the FILMTEC BW30-3030 model. This membrane element has a capacity of 2400 gallons and is suitable for both commercial and household use. With a filtration method that effectively removes micro-organisms, this RO membrane is an essential component for maintaining clean and safe drinking water in your home or business.