Your HME adapter should be changed according to the table below.  The cartridge is good for 3-7 days once opened and cannot be cleaned.  Discard old cartridges and replace.   Accessory Periodic Cleaning Cycle Product Service Life AirFlex Hose Weekly 3 Months WhisperSoft Muffler Weekly 3 Months AirMist HME Adapter Weekly 3 Months