Protect your Viktor Air Purifier from large pollutant particles and remove strong unpleasant odours with the Stadler Form Viktor Replacement Pack. This replacement filter pack comes with an activated carbon filter that eliminates stifling smells and lets you breathe easy throughout the day! Replacement Pack Features Pre-filter and activated carbon filter Protects from large pollutants Both filters should be replaced every 6 months (smokers 2 months)