I don't use these as I don't have this type of coffee maker ( nor do I drink coffee often), I don't know if they work or not.
These look really cool though and could be something to think about if you just read my reduce and reuse post.
There is also a brand called ekobrew:
Green your coffee habit ;)
Anyway, just was browsing online and saw these. So try them at your own risk as I haven't tried them, but they look cool!
Be Happy Healthy & Strong,