Clogged filters reduce the suction capacity of the vacuum cleaner. Cleaning and changing filters regularly helps maintain its best performance. Hygiene filter E12 captures even the very finest particles (99, 5% of particles down to 0, 06micron) particles like pollen, mould spores, dust mite faeces and allergens. By purifying the air leaving the vacuum cleaner, this filter reduces the risk of allergic reactions. Just wash it under running water and wait to get it dry before using it again. For the optimal performance of the vacuum cleaner, we recommend that you change all filters at least twice a year or when they get dirty so that you can see it. Check compatibility before purchase