Review on Enhance Your Air Quality with Colorfullfe Performance Plus Filter for Holmes AER1 True Filter: 4 Filters and 8 Carbon Filters by Allen Wagner

The purple filter doesn't work as well as my regular purple Aer filter. I live in the desert and the Aer1 would be covered in dust and would need to be cleaned every week. These don't seem all that good. I had to clean them once a month. The black pre-filter is too thick and not the right size. They make the air purifier incredibly noisy because they block the flow of air so much. For this reason I have decided not to use them. I didn't want to burn the air purifiers in my house by using them. So the black pre-filters are useless.