I live in wonderful, but older apartments.  Management always changes the filters, but I wanted a better one.  I read about Filtrere and bought one about 2 years ago.  I have purchased them ever since.  I use the little sticker and mark the date it needs to be changed.  When I remove it from the system I can see what it has filtered.  The filter is literally black.  I am very pleased and am willing to pay more for a good quality filter.  I wish I would have taken a photo of it before I discarded it, but I will next time. [This review was collected as part of a promotion.]