4 Filters of 10" RO standard. 1- Filter of sediments 5 micron. 1- Filter of Carbón GAC T-33. 1- Filter of Carbón BLOCK. 1- Post-filter Jaco connection. The postfilter utilize coconut sell GAC and are designed to remove unpleasant taste and odors as well as sediment to produce cleaner, clearer, better tasting water. These Granular Activated Carbon filters are easily installed on the water line to an automatic icemaker, Reverse Osmosis System or water dispensing system. Our specially designed spring eliminates the question of bypass. By packing the carbon your concerns of shifting carbon inside the filter is removed. Change this filters in 6 to 12 months.