CKeditor strips Tag

CKeditor strips Tag

I'm trying to find a solution to avoid ckeditor , but also the older fck
editor strips out any tag from previously inserted content to the db.
Case:
i insert html content to the db, some content contain the <i> elements. I
do this with the ckeditor. Everything works perfect and the content shows
up on the webpage. But when i want to edit the previously inserted content
, the elements are missing.
In my specific case i use:
<i class="fa-icon-fullscreen fa-icon-xxlarge main-color"></i>
Ofcourse if i disable the editor , the content shows up just fine in the
textarea.