The pre-filters should be washed once a month and replaced every 6 months, the main filter should be washed once every 6 months and replaced every 1 year.

LEVOIT Cordless Vacuum Cleaner, 400W Motor Stick Vac with Powerful Suction and Auto Mode, Up to 40 Minutes Runtime, 4-Stage HEPA Filter, Deep Clean Carpet, Hard Floor, Pet Hair, Grey