I've just purchased a T7. I'm very pleased. My query is regarding keeping the surface of the stone functional. I have 'cleaned up' a number of chisels and gouges but my last re-sharpening took an hour on a 1" bevel edged chisel. I've read about emptying the water vessel frequently, and removing wastage, which I will now do regularly. What is the best way to return the stone to pristine condition? Is it using the stone grader? Or do I need to re-dress the stone? Thanks , in advance