The lifespan depends on usage and grit,the hardness of the materials being sharpened, and maintenance. With proper care,for the coarse grit, it can last many years, even for those sharpening 5 to 10 times a week, Regular cleaning and light pressure extend its durability.

Just spray some water on the CBN & Diamond Sharpening Stone.

To clean the Diamond Whetstone, gently wipe the surface with a dry paper towel. If particles are clogged, use a rubber eraser or nylon brush to remove them. This will restore the stone to its original condition.

No, the dark areas are dried dirt from sharpening, not a sign of the
abrasives wearing off. These marks don't affect performance and can be left as is.For minor marks, use an eraser.For stubborn stains, clean with Bar Keepers Friend and air dry fully.