In an exemplary sharpening element storage embodiment of the present invention, a sharpening element may be inserted in a groove that would be provided in an interior wall of a knife handle. The tapping device has an upper projection for being axially fixed in, for example, a drill press. 49\xd71019 atomscm3 or less, and the phosphorus concentration P and the Ge concentration Ge in the silicon monocrystal satisfy a relationship according to a formula as follows while growing the silicon monocrystal. Input can be received from the analyst indicating a resolution of an exception. Since forward osmosis is independent of both the type of membrane and the fluid type, it can be widely applied to many fluid processes within the water treatment and non-water treatment industries such as the food and beverage, medical, and chemical industries.