[Creetin]

Well i have ownes 3 ca/rx, and this is my list.

MRC
GEO
Korallin, and i reallyu didnt like the korallin much and it was the shortest lived on my setup/ It was fussy to keep it going clogged frequently, and was a pita.
The Geo is somewhat of a pita to maintain as well. It clogs about once a month and has a meltdown even with large media!!!
The MRC is the best because it never clogged, and stayed rock solid on ca demand.
The GEO is built a little tougher, But i would rather take my chances with the MRC. IMO