The humidified clear out should be wiped clean as soon as per week Soaked in fit to be eaten white vinegar for half an hour, and then rinsed with water for three times to remove scale and kill bacteria and keep away from breeding bacteria. It is usually recommended to interchange it inside 3 months. Colour:Blue Material:Paper Package Contents: 1X Humidification Filter Replacement Only the above package content, other merchandise should not included. Note: Light mirrored image and diverse exhibits could cause the colour of the object in the photo a bit of various from the genuine thing. The size allowed error is +/- 1-3cm.