Maintenance and replacement of filters is extremely important to enjoy the sure, long-term operation of your device. In models that have a Pre-filter (grid) it is advisable to clean every 2-4 weeks of the largest particles - dust, fur, hair. This extends the life of the rest of filters and ensures continuous operation of the purifier. The regular replacement of the remaining filters is important so that they do not become a source of the pollutants they once absorbed.