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What Size Membrane to Re-Order? The 50 GPD reverse osmosis membrane is the most popular size for home reverse osmosis systems. When replacing the membrane it is also recommended that you replace the Flow Restrictor.
TW30-1812-50 Dow Filmtec 50 GPD TFC Replacement Membrane for Undersink Reverse Osmosis (RO) System
Polyamide Thin-Film Composite (TFC)
Rated at 50 psi and purifies about 20% more water than elements rated at 60 psi
Shipped dry for convenience and a long shelf life
Free Chlorine Tolerance: <0.1 ppm Dow genuine membrane element, NSF/ANSI Standard 58 certified