22 pieces of 10" x 2. 5" Replacement Water Filters for Reverse Osmosis Water Systems - 3 Years' Supply-100GPD RO membrane What Are Included - 6 piece of 5 Micron Sediment Filter: With only five micron rating, it is effective in removing dirt, rust and sand particles. NSF certified. - 6 piece of Granular Activated Carbon (GAC) Filter: Adsorb chlorine, halide, organic contaminants, odors, and other impurities that contribute to bad taste and odor. - 6 piece of 5 micron Carbon Block Filter: Remove any remaining chlorine and organic chemicals. Further enhance the taste of water. - 1 piece of 100 GPD Reverse Osmosis Membrane: A thin film composite (TFC) high quality membrane that processes 100 gallons per day. It rejects wide spectrum of impurities down to . 0001 micron. The TFC membrane is tested and certified by NSF International. - 3 piece of Post Carbon Inline filter: This carbon post filter removes objectionable tastes and odors to enhance the quality of your drinking water. Why Purchase From us - Honest seller, more than 2000 positive feedbacks on eBay - Free tech support before and after sale - Ship from Atlanta warehouse daily. Only 2-day transit time for most states in Eastern Time zone and part of Central time zone (including Texas) We also carry many other home filter systems.