This huge combination of particle and carbon filter for blue pure 221 air filter catches virtually every airborne contaminant such as pollen, dust, pet dander, mould spores, allergens and bacteria. The layer of active carbon even removes smoke, odours, gases and VOCs. The material is 100% recyclable. The entire bottom half consists of an advanced filter. The filter area works its hardest for a long time, up to 6 months before it needs replacing. It is also far less dense than other filters, with millions of ultra-thin fibres of different sizes in different layers. The result is less air pressure, less noise but a higher airflow and a cleaner room. It will last 6 months before needing to be replaced.