The purchase was fine although I will not be installing them until I have used up my present filter. I've read they are good! I currently use Peculator filters of the same type as these and they seem to leave lots of dust on tables and things in the house. I hope when I install these the dusts is less than what I see today. Just maybe this is a wife neglect problem. Maybe I will solve this and maybe I won't. Let's hope I'm impressed with the filters results.