TFM 24 GPD RO Reverse Osmosis GE Membrane Compatible FX12M w/ Pre & Post Filters NSF 58 Certified Pre-filter CA Ware 10" x 2-1/2", 1 Micron Carbon Block Filter Cartridge is class 1 chlorine, taste & odor reduction and is made with premium quality coconut shell activated carbon. Replace every 6 months after installation. Post-filter CA Ware 10" x 2-1/2", 5 Micron Carbon Block Filter Cartridge is class 1 chlorine, taste & odor reduction and is made with premium quality coconut shell activated carbon. Replace every 6 months after installation Membrane TFM-24 (replace every 2 years after installation). Not GE FX12M membrane. Use the membrane after the purchase soon. I provide 3 month's warranty from the delivery date.