Soap dispenser - Wikipedia
Some soap dispensers take solid bars of soap, and grate, plane, or grind them to flakes or powder as they are dispensed. About 40g fresh weight of soap is equivalent to 1 liter of liquid soap, providing soap for up to 400 handwashings.. Soap mills are common in public washrooms in Germany. Soap graters made specifically for home use also exist; they can be wall-mounted, or free-standing (like ...