Amazon.com: Dow FilmTec, BW60-1812-75 75 GPD TFC Membrane for Undersink Reverse Osmosis (RO) System (Replaces Model TW30-1812-75) : Tools & Home Improvement
Amazon.com: FilmTec, TW30-1812-50HR 50 gpd TFC High Rejection Membrane for Undersink Reverse Osmosis (RO) System (Replaces Model TW30-1812-50) : Tools & Home Improvement
DOW FILMTEC BW30-400/34 Membrane RO Filter Element, 8" High Rejection
Filmtec 36, 75 & 100 GPD Filmtec DOW RO Membrane 3 different Models | eBay