Blocked filters will reduce the suction in your vacuum cleaner. Cleaning and replacing your filters regularly will help to maintain its best performance. This pack includes: 3x micro filter to purify the air leaving the vacuum cleaner. 3x motor filter to remove contaminates from the air before it cycles through the motor. For optimum performance of your vacuum cleaner, we recommend you replace all filters at least twice a year or when they become visibly soiled.