Complete cartridge filtration kit for OsmoDRINK water purification system containing 1 sediment filter, 2 compacted carbon filters, and 1 coconut carbon finishing filter. The sediment filter removes larger particles, the carbon filters remove chlorine and chemical pollutants, while the finishing cartridge eliminates unpleasant odors and tastes. Replacement recommended every 12 months. Replace the reverse osmosis membrane independently every 18 months.