FX18M Features: -Membrane.-The GE FX18M reverse osmosis membrane produces healthier, better-tasting drinking water and cooking water.-The GE FX18M SmartWater RO Membrane improves flavor of hot and cold beverages including coffee, tea, and juices.-he GE FX18M Membrane is a thin film polyamid reverse osmosis membrane.-The GE FX18M reduces Arsenic, Chromium, Lead, Cysts, Sodium, Sulfate, Ammonia, Nitrate/Nitrite, Tannins, Copper, Magnesium, Chlorine Taste and Odor, Sediment, Rust.-he GE FX18M should be replaced approximately every two to three years. Dimensions: -GE FX18M RO Membrane Specs: Dimensions: 10.5" x 1.5" (not including attached end fittings)-->Micron Rating (Nominal): 0.5 - 1.-Overall dimensions: 1" H x 11" W x 1" D.