So that the Klarstein Vita Pure 2G air purifier is always functioning at full capacity, it is necessary to replace the 3-in-1 filter at regular intervals. The combination filter is comprised of, like the original, a prefilter for the removal of larger dust particles, a HEPA filter against microbes, fine dusts & allergens as well as an activated carbon filer to erase odors. Regularly changing the air filter maintains the performance of the device & ensures permanently clean air in your house or office. The 3-in-1 filter is easily used in place of the original filter in the device & with its 28.6 x 30 cm fits in the Klarstein Vita Pure 2G air purification device.