Filter or Wick Replacements for Mini Humidifier or Aroma Inhalers - 44 mm - Filtrwix By Kruzco FILTRWIX are 44mm in length. Filters or Wicks, are for your Humidifer. FILTRWIX Help Keep Humidifiers Clean and Help Extend A Humidifiers Life Works with Kruzco Modles and other portable USB humidifier. FILTRWIX Remove minerals and pollutants from water. Individually packaged for convenience. USE: 1.) Fully submerge the filter before plugging for best mist effect. 2.)Plug the replacement filter into the receptacle on the portable USB humidifier 3.)Replace filter about every TWO to THREE MONTHS (depending on use and local water quality Help keep your humidifier clean and extend humidifier life