wiki- Mennaoshi

Definition: A maintenance process that restores a whetstone’s surface to a flat state, ensuring consistent and effective knife sharpening.
Details: Over time, whetstones develop depressions in frequently used areas, leading to uneven sharpening. Mennaoshi involves grinding down these high and low spots to restore a level surface. This not only improves sharpening accuracy but also extends the lifespan of the whetstone.
Comparison: Unlike standard sharpening, which works on knives, mennaoshi is performed on the whetstone itself. Specialized flattening stones (often coarse-grit) are used, differing from correction whetstones in that their sole purpose is surface leveling.
Practical Use: The process involves applying water to both stones, then rubbing the whetstone against a flattening stone in circular or back-and-forth motions until flat. Afterward, both stones should be rinsed and air-dried slowly to prevent cracking. Regular mennaoshi keeps whetstones efficient and reliable.
Tools: Flattening stones, water for lubrication and debris removal, and sometimes diamond plates for faster or more precise flattening.

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