I don't think it's recommended to cool your wort by adding ice. You probably did water your beer down a bit by doing that, but more importantly it's a sanitation issue. Ice can carry lots of contaminants. If anything you should set the wort in an ice bath if possible, or just let it cool naturally. If you really want to use ice, make it with water that has been boiled first.
Last edited by obsoletist; 01-14-2012 at 09:58 PM.