This SEBO Felix Vacuum Cleaner Filter is for use in their FELIX uprights to keep them functioning in optimal condition. This filter has carbon embedded in the filter to help reduce odors being emitted from the machine. Anti-Odor Technology helps destroy smells and absorb them before air is released from the machine. It is found below the paper bag in the vacuum. To keep your vacuum cleaner in an ideal state, change the filter periodically when it appears darkened.