Blunt blades are bad for business. This Shun 300/1000 grit combination whetstone is the tool to turn to when your knife is very dull. The 300 grit side should be coarse enough to remove unneeded material from the blades edge, revealing sharpness once more. The 1000 grit side should then be used to polish up the blade, and to smooth the edge into a razor sharp point. At this point, if you require a knife sharper than this, we recommend the Shun 1000/6000 Combination Whetstone.
While they are spelt differently, a whetstone does need to be wet to be used. This isn't how the stone got its name, however; "to whet" something is to sharpen it.
There you go.
This doesn't stop the stone from needing to be wet however - the whetstone needs to be thoroughly soaked (a wholly wet whetstone).