Originally Posted by somewhatshocked
You can use any ceramic ring media you like. Doesn't have to be expensive Eheim stuff, though I use it and enjoy it. The kind of media you use is up to your personal taste. Many like ceramic rings, sponges, crushed lava rock, pot scrubbers, filter floss, etc.
Purchase the amount listed in the filter specification/documentation listed on Eheim's website for your particular filter. Typically listed in volume.
Are you saying that I should use this media in both the layers I point out in the OP? I'm confused, sorry.