How do I replace my sponge filter? Customer Support September 11, 2020 12:31 Updated Follow Detach the water tank by turning it counter-clockwise Remove plastic cover containing the sponge filter by pulling the cap off Replace with a newly soaked sponge filter Put the cap back on and attach the tank back on the diffuser Related articles How do I use my In-Car Essential Oil Diffuser? Help! What do I do if my In-Car Essential Oil Diffuser is not working? Do you have a guide for your essential oils to me decide what I need? What is the best way to contact you? How do I use a carrier oil to dilute my essential oils? Comments 0 comments Please sign in to leave a comment.