JUst a quick question; when you get a tumbler from kellyco, it comes with some aquarium rocks and some white powder....what is the white powder anyway?
The powders, they come in different grades, usually "coarse, fine, pre-polish, polish, etc." They also come in different materials depending on what you are tumbling and to what extent you wish to either clean or polish your items. You can do a search for polishing grits as there are several sources and tutorials in regards to these different processes.