The hygiene filter makes home a healthier place to live by purifying the contaminates. Hygiene filter traps the dirt, dust, and allergens and prevent them from recirculating back into the room thus purifying the air to the maximum. To ensure that your vacuum cleaner is working at its best, its important to regularly change its filters We recommend that filters should be replaced at least twice a year, or when they become visibly soiled. Please check compatibility before ordering.