You probably don't want to use
AC all the time. If your water starts to get a yellowish tinge to it, the
AC will remove the compounds that are causing it. The ceramic rings are good bio media and, as Electrobes pointed out, require only occasional rinsing to keep them in good shape. I'd rinse them in tank water to keep from killing off so much of the bacteria on them though. Check the articles link on the home page for more info on
AC.