Pentek TLC-100 Reverse Osmosis Membrane, TLC Thin Layer Composite Residential Me̩mbrane Replacement, 100 GPD Flow Rate, 101, White Industry-Leading State-of-the-art TLC Membrane provides high quality water for a broad range of water sources. It has Standard Dimensions (11.75" x 1.79") to fit in commonly available housings. 100% Dry Membrane to maximize shelf life. NSF INTERNATIONAL tested and certified for your peace of mind. 100 GALLON PER DAY (378 LPD) flow rate with 98% nominal rejection.