Review on Purifiers Premium Desktop Purifier Filtration by April Simpson

I've been using two of these since April 2021, now October 2021 - at the time of writing this review. The device indicated it was time to change the filters in both devices I own. I really like this HEPA filter, it works well. The problem is that I can't find any suitable replacement filters, everything is too big. Filter dimensions: 3" high, 6.25" outer width, 4" center hole. It seems I'm out of luck and out of money as I've been trying everywhere to find suitable filters and haven't been able to. Blocks are useless if I can't find replacement filters.