If you guys are really curious, the abrasive particles in Jnats are actually quite a bit finer than you'd suspect from their initial grit due to the stones containing macro-structures made up of particles bound together. These structures break down during use into the individual particle size. This happens much more on the surface of the stone, the act of slurrying being mostly sufficient to fully disassociate these structures in the free slurry. However, with certain techniques matched with certain stones, free slurry is more efficient at refining the structures embedded in the stones surface than a tool on water is, creating a sense of the slurry actually refining with use. And I know this because potato.