A Senseo doesn't use coffee filters because frankly it doesn't need them. The Senseo is a pod machine and therefore it uses coffee pods. Pods are single served pre portioned pack of coffee grounds. All you do is place the pod in your machine, and press what size you would like and in less then 2...
What brand of coffee are you using for your Keurig? My favorite is Gloria Jeans. I have found that some of the Green Mountains are a little on the weird tasting side but they have one of the biggest selections to choose from. Although I do need to put in a shameless plug for their Golden French...
I would highly recommend the Senseo machine. I have one and I love it. Also, I find that if you put the unused pods in the freezer you do not get a stale taste as the freezer keeps them fresh. I would google the Senseo machine and see if it is the right kind for you. If you have any questions...
I'm new here and this is my first post but I do have to comment on this post. Although I am a loyal Keurig Fan and always will be I do own a Senseo machine and find that if you put the pods in the freezer when not in use, it prevents them from getting that stale old taste. In my experience...