If you have knives made with a very hard metal, using a steel is pointless because it is very unlikely that the metal at the blade would have curled like on an average german knife which is made of softer metal. Getting a ceramic rod is better but that will take a bit of metal off the blade and cause larger micro serations. If you were a knife freak, getting a glass rod would an ideal solution. Here is my take. If you use waterstones, using a ceramic steel or any steel rod to hone the edge defeats the purpose. You spend a good deal of time getting the edge sharp and finishing to mirror shine which means a truly sharp edge with minimal and absolutely tiny micro serations only to destroy that edge with a steel rod that not only ruins the mirror finish and the tiny micro serations with an edge that has larger micro serations. Use a 800-1000 waterstone to recreate a new edge, use the 6000 side to create a mirror finish which should take no more then 5-6 passes. Every other week, run the knife 4-5 times on the 6000 side to hone the blade and you are good to go.