Filter cartridge, roller, and air humidifier

A humidifier for humidifying air by cold evaporation of water, with a tank for the storage of the water, wherein a roller for humidifying air through cold evaporation of the water as well as a motorized drive for rotation of the roller about an axis of rotation are provided, wherein the roller has a shaft and at least one plate, wherein the at least one plate is arranged coaxially in respect to a shaft, wherein the roller is designed such that at least one plate dips at least partially into the water, in order for the moistened part exiting with further rotation from the water to release the water through cold evaporation of the air to be dehumidified, wherein the roller comprises a filter cartridge, which is designed for filtering water for use in a humidifier or the like, with a storage space for the storing of filter material, the filter material including at least ion exchange resin, activated carbon or the like, and with at least one opening in order to supply the water to be filtered to the storage space and/or to release it from the storage space, wherein the filter cartridge is designed to be arranged in the tank with the water to be filtered, so that the filter cartridge can protrude into the water stored in the tank, wherein the at least one opening is designed both as a water inlet for supplying water from the tank into the storage space as well as the water outlet for release of water from the storage space into the tank, wherein a mounting device is provided to be mounted in the tank, the mounting device defining a hub for fastening to the shaft and/or axis of rotation, wherein the filter cartridge is applied to the shaft, wherein the filter cartridge is applied to the shaft, wherein the filter cartridge, having the at least one opening is arranged in and/or on the tank such that the water absorbed by the filter cartridge from the tank for the filtering is released again into the tank to the water which has not yet been absorbed, wherein the filter cartridge has at least one transport structure for the absorption and release of water, wherein the at least one transport structure is designed as a separation wall for the separation of individual compartments within the storage space, wherein at least two of the compartments are mutually filled with different filling materials, wherein at least one of the following filling materials is provided:

• ion exchange resin, active carbon, a fragrant substance, and a hygiene agent, which is designed for the purification and/or disinfection of the water.