FILMTEC™ Membrane Elements We carry a large stock of genuine DOW/ FILMTEC membrane elements.  Please select a category below. FilmTec Residential Membranes 1.8" Dia. for Under the Counter RO TW30-1812-24,  TW30-1812-36,  TW30-1812-50,  TW30-1812-75,  TW30-1812-100 FilmTec Commercial RO Membranes 2" - 4" Dia. for Tap & Brackish Water TW30, XLE, LP, BW30, TW30HP FilmTec Industrial RO Membranes 8" Dia. for Tap & Brackish Water BW30, BW30LE, LE, XLE, FilmTec Seawater RO Elements 2.5" - 8" Dia. Seawater FilmTec Membranes SW30, SW30HR, SW30HRLE FilmTec Nanofiltration (NF) Elements 2.5" - 8" Dia. NanofiltrationFilmTec Membranes NF90, NF270, NF200, NF FilmTec Full Fit Sanitary RO Membranes 4" - 8" Sanitary-Style (Heat Sanitizable) Full-Fit Cage Wrapped RO, HSRO