Exactly two years ago I paid more 21,80 for this filter. The last year he har 23.80 cost, and for several weeks it costs 28.90 EUR. If this continues, the cost here one year probably about 30 EUR. This is clearly too much, especially because it also always in 3- he comes Pack, and when a filter replacement is, then it is the Hepa filter staubaufsaugende and the other one does not so often change indeed. So, here the business is made unique with the filters. And being smeared customers (like me) are so dependent on filter, otherwise they have nothing of the air cleaner. If you already raising prices, one should also raise the performance. But it is not (yet) nothing to remember!