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A 600 could work for knives, of course it would be slower than a lower grit for material removal. I've been using a Crystilon for material removal and finishing on a hard Washita for my knives...

They are very different. The Chosera [pro] has a mineral type binder and the feel of a stone. The Superstone [sharpening series, or SP] has a resin binder and feels kind of like plastic. Are you sure...