Blocked filters will reduce the suction in your vacuum cleaner. Cleaning and replacing your filters regularly will help to maintain its best performance. The high grade of material, used for our filters, provides your vacuum cleaner with a high filtration level and maximum dust retention. This kit includes 2x micro filters for the following cleaners: CYCLONE POWER MAX Z5500, Z5501, CYCLONE POWER ULTIMA Z5600A. We recommend that filters should be replaced at least twice a year or when they become visibly soiled.