Eheim's sites is seriously the worst ever.
Clicking on the FAQ link here
, for example, goes to a 404. Clicking on the link for the manual or FAQ on the product page goes to a 404. Terrible.
What you linked is what comes with the filter. In terms of using something else, I can't see how Eheim ceramic rings could be better than another brand so if I ever replaced mine, I would personally just buy a different brand. Nothing is wrong with buying the Eheim brand, the point is you really get the same from any brand.
I have always just setup my filters how they are advertised, minus the carbon. Well, I will use carbon if it comes with the filter and take it out on first cleaning and not replace it. Other than that, the only media I have added is Purigen by Seachem.
Thanks. Yeah, I'm bascially just trying to avoid paying Eheim's premium.